The pound or pound-mass is a unit of mass used in the imperial, United States customary and other systems of measurement. Various definitions have been used; the international standard symbol for the avoirdupois pound is lb. The unit is descended from the Roman libra; the English word pound is cognate with, among others, German Pfund, Dutch pond, Swedish pund. All derive from a borrowing into Proto-Germanic of the Latin expression lībra pondō, in which the word pondō is the ablative case of the Latin noun pondus. Usage of the unqualified term pound reflects the historical conflation of weight; this accounts for the modern distinguishing terms pound-force. The United States and countries of the Commonwealth of Nations agreed upon common definitions for the pound and the yard. Since 1 July 1959, the international avoirdupois pound has been defined as 0.45359237 kg. In the United Kingdom, the use of the international pound was implemented in the Weights and Measures Act 1963; the yard or the metre shall be the unit of measurement of length and the pound or the kilogram shall be the unit of measurement of mass by reference to which any measurement involving a measurement of length or mass shall be made in the United Kingdom.
An avoirdupois pound is equal to 16 avoirdupois ounces and to 7,000 grains. The conversion factor between the kilogram and the international pound was therefore chosen to be divisible by 7, an grain is thus equal to 64.79891 milligrams. In the UK, the process of metrication and European units of measurement directives were expected to eliminate the use of the pound and ounce, but in 2007 the European Commission abandoned the requirement for metric-only labelling on packaged goods there, allowed for dual metric–imperial marking to continue indefinitely; when used as a measurement of body weight the UK practice remains to use the stone of 14 pounds as the primary measure e.g. "11 stone 4 pounds", rather than "158 pounds", or "72 kilograms" as used elsewhere. The US has not adopted the metric system despite many efforts to do so, the pound remains used as one of the key United States customary units. In different parts of the world, at different points in time, for different applications, the pound has referred to broadly similar but not identical standards of mass or force.
The libra is an ancient Roman unit of mass, equivalent to 328.9 grams. It was divided into ounces; the libra is the origin of the abbreviation for pound, "lb". A number of different definitions of the pound have been used in Britain. Amongst these were the avoirdupois pound and the obsolete Tower, merchant's and London pounds. Troy pounds and ounces remain in use only for the weight of certain precious metals in the trade; the pound sterling was a Tower pound of silver. In 1528, the standard was changed to the Troy pound; the avoirdupois pound known as the wool pound, first came into general use c. 1300. It was equal to 6992 troy grains; the pound avoirdupois was divided into 16 ounces. During the reign of Queen Elizabeth, the avoirdupois pound was redefined as 7,000 troy grains. Since the grain has been an integral part of the avoirdupois system. By 1758, two Elizabethan Exchequer standard weights for the avoirdupois pound existed, when measured in troy grains they were found to be of 7,002 grains and 6,999 grains.
In the United Kingdom and measures have been defined by a long series of Acts of Parliament, the intention of, to regulate the sale of commodities. Materials traded in the marketplace are quantified according to accepted units and standards in order to avoid fraud; the standards themselves are defined so as to facilitate the resolution of disputes brought to the courts. Quantifying devices used by traders are subject to official inspection, penalties apply if they are fraudulent; the Weights and Measures Act of 1878 marked a major overhaul of the British system of weights and measures, the definition of the pound given there remained in force until the 1960s. The pound was defined thus "The... platinum weight... deposited in the Standards department of the Board of Trade... shall continue to be the imperial standard of... weight... and the said platinum weight shall continue to be the Imperial Standard for determining the Imperial Standard Pound for the United Kingdom". Paragraph 13 states that the weight in vacuo of this standard shall be called the Imperial Standard Pound, that all other weights mentioned in the act and permissible for commerce shall be ascertained from it alone.
The First Schedule of the Act gave more details of the standard pound: it is a platinum cylinder nearly 1.35 inches high, 1.15 inches diameter, the edges are rounded off. It has a groove about 0.34 inches from the top, to allow the cylinder to be lifted
Australia the Commonwealth of Australia, is a sovereign country comprising the mainland of the Australian continent, the island of Tasmania and numerous smaller islands. It is the world's sixth-largest country by total area; the neighbouring countries are Papua New Guinea and East Timor to the north. The population of 25 million is urbanised and concentrated on the eastern seaboard. Australia's capital is Canberra, its largest city is Sydney; the country's other major metropolitan areas are Melbourne, Brisbane and Adelaide. Australia was inhabited by indigenous Australians for about 60,000 years before the first British settlement in the late 18th century, it is documented. After the European exploration of the continent by Dutch explorers in 1606, who named it New Holland, Australia's eastern half was claimed by Great Britain in 1770 and settled through penal transportation to the colony of New South Wales from 26 January 1788, a date which became Australia's national day; the population grew in subsequent decades, by the 1850s most of the continent had been explored and an additional five self-governing crown colonies established.
On 1 January 1901, the six colonies federated. Australia has since maintained a stable liberal democratic political system that functions as a federal parliamentary constitutional monarchy, comprising six states and ten territories. Being the oldest and driest inhabited continent, with the least fertile soils, Australia has a landmass of 7,617,930 square kilometres. A megadiverse country, its size gives it a wide variety of landscapes, with deserts in the centre, tropical rainforests in the north-east and mountain ranges in the south-east. A gold rush began in Australia in the early 1850s, its population density, 2.8 inhabitants per square kilometre, remains among the lowest in the world. Australia generates its income from various sources including mining-related exports, telecommunications and manufacturing. Indigenous Australian rock art is the oldest and richest in the world, dating as far back as 60,000 years and spread across hundreds of thousands of sites. Australia is a developed country, with the world's 14th-largest economy.
It has a high-income economy, with the world's tenth-highest per capita income. It is a regional power, has the world's 13th-highest military expenditure. Australia has the world's ninth-largest immigrant population, with immigrants accounting for 26% of the population. Having the third-highest human development index and the eighth-highest ranked democracy globally, the country ranks in quality of life, education, economic freedom, civil liberties and political rights, with all its major cities faring well in global comparative livability surveys. Australia is a member of the United Nations, G20, Commonwealth of Nations, ANZUS, Organisation for Economic Co-operation and Development, World Trade Organization, Asia-Pacific Economic Cooperation, Pacific Islands Forum and the ASEAN Plus Six mechanism; the name Australia is derived from the Latin Terra Australis, a name used for a hypothetical continent in the Southern Hemisphere since ancient times. When Europeans first began visiting and mapping Australia in the 17th century, the name Terra Australis was applied to the new territories.
Until the early 19th century, Australia was best known as "New Holland", a name first applied by the Dutch explorer Abel Tasman in 1644 and subsequently anglicised. Terra Australis still saw occasional usage, such as in scientific texts; the name Australia was popularised by the explorer Matthew Flinders, who said it was "more agreeable to the ear, an assimilation to the names of the other great portions of the earth". The first time that Australia appears to have been used was in April 1817, when Governor Lachlan Macquarie acknowledged the receipt of Flinders' charts of Australia from Lord Bathurst. In December 1817, Macquarie recommended to the Colonial Office. In 1824, the Admiralty agreed that the continent should be known by that name; the first official published use of the new name came with the publication in 1830 of The Australia Directory by the Hydrographic Office. Colloquial names for Australia include "Oz" and "the Land Down Under". Other epithets include "the Great Southern Land", "the Lucky Country", "the Sunburnt Country", "the Wide Brown Land".
The latter two both derive from Dorothea Mackellar's 1908 poem "My Country". Human habitation of the Australian continent is estimated to have begun around 65,000 to 70,000 years ago, with the migration of people by land bridges and short sea-crossings from what is now Southeast Asia; these first inhabitants were the ancestors of modern Indigenous Australians. Aboriginal Australian culture is one of the oldest continual civilisations on earth. At the time of first European contact, most Indigenous Australians were hunter-gatherers with complex economies and societies. Recent archaeological finds suggest. Indigenous Australians have an oral culture with spiritual values based on reverence for the land and a belief in the Dreamtime; the Torres Strait Islanders, ethnically Melanesian, obtained their livelihood from seasonal horticulture and the resources of their reefs and seas. The northern coasts and waters of Australia were visited s
International System of Units
The International System of Units is the modern form of the metric system, is the most used system of measurement. It comprises a coherent system of units of measurement built on seven base units, which are the ampere, second, kilogram, mole, a set of twenty prefixes to the unit names and unit symbols that may be used when specifying multiples and fractions of the units; the system specifies names for 22 derived units, such as lumen and watt, for other common physical quantities. The base units are derived from invariant constants of nature, such as the speed of light in vacuum and the triple point of water, which can be observed and measured with great accuracy, one physical artefact; the artefact is the international prototype kilogram, certified in 1889, consisting of a cylinder of platinum-iridium, which nominally has the same mass as one litre of water at the freezing point. Its stability has been a matter of significant concern, culminating in a revision of the definition of the base units in terms of constants of nature, scheduled to be put into effect on 20 May 2019.
Derived units may be defined in terms of other derived units. They are adopted to facilitate measurement of diverse quantities; the SI is intended to be an evolving system. The most recent derived unit, the katal, was defined in 1999; the reliability of the SI depends not only on the precise measurement of standards for the base units in terms of various physical constants of nature, but on precise definition of those constants. The set of underlying constants is modified as more stable constants are found, or may be more measured. For example, in 1983 the metre was redefined as the distance that light propagates in vacuum in a given fraction of a second, thus making the value of the speed of light in terms of the defined units exact; the motivation for the development of the SI was the diversity of units that had sprung up within the centimetre–gram–second systems and the lack of coordination between the various disciplines that used them. The General Conference on Weights and Measures, established by the Metre Convention of 1875, brought together many international organisations to establish the definitions and standards of a new system and standardise the rules for writing and presenting measurements.
The system was published in 1960 as a result of an initiative that began in 1948. It is based on the metre–kilogram–second system of units rather than any variant of the CGS. Since the SI has been adopted by all countries except the United States and Myanmar; the International System of Units consists of a set of base units, derived units, a set of decimal-based multipliers that are used as prefixes. The units, excluding prefixed units, form a coherent system of units, based on a system of quantities in such a way that the equations between the numerical values expressed in coherent units have the same form, including numerical factors, as the corresponding equations between the quantities. For example, 1 N = 1 kg × 1 m/s2 says that one newton is the force required to accelerate a mass of one kilogram at one metre per second squared, as related through the principle of coherence to the equation relating the corresponding quantities: F = m × a. Derived units apply to derived quantities, which may by definition be expressed in terms of base quantities, thus are not independent.
Other useful derived quantities can be specified in terms of the SI base and derived units that have no named units in the SI system, such as acceleration, defined in SI units as m/s2. The SI base units are the building blocks of the system and all the other units are derived from them; when Maxwell first introduced the concept of a coherent system, he identified three quantities that could be used as base units: mass and time. Giorgi identified the need for an electrical base unit, for which the unit of electric current was chosen for SI. Another three base units were added later; the early metric systems defined a unit of weight as a base unit, while the SI defines an analogous unit of mass. In everyday use, these are interchangeable, but in scientific contexts the difference matters. Mass the inertial mass, represents a quantity of matter, it relates the acceleration of a body to the applied force via Newton's law, F = m × a: force equals mass times acceleration. A force of 1 N applied to a mass of 1 kg will accelerate it at 1 m/s2.
This is true whether the object is floating in space or in a gravity field e.g. at the Earth's surface. Weight is the force exerted on a body by a gravitational field, hence its weight depends on the strength of the gravitational field. Weight of a 1 kg mass at the Earth's surface is m × g. Since the acceleration due to gravity is local and varies by location and altitude on the Earth, weight is unsuitable for precision
Canada is a country in the northern part of North America. Its ten provinces and three territories extend from the Atlantic to the Pacific and northward into the Arctic Ocean, covering 9.98 million square kilometres, making it the world's second-largest country by total area. Canada's southern border with the United States is the world's longest bi-national land border, its capital is Ottawa, its three largest metropolitan areas are Toronto and Vancouver. As a whole, Canada is sparsely populated, the majority of its land area being dominated by forest and tundra, its population is urbanized, with over 80 percent of its inhabitants concentrated in large and medium-sized cities, many near the southern border. Canada's climate varies across its vast area, ranging from arctic weather in the north, to hot summers in the southern regions, with four distinct seasons. Various indigenous peoples have inhabited what is now Canada for thousands of years prior to European colonization. Beginning in the 16th century and French expeditions explored, settled, along the Atlantic coast.
As a consequence of various armed conflicts, France ceded nearly all of its colonies in North America in 1763. In 1867, with the union of three British North American colonies through Confederation, Canada was formed as a federal dominion of four provinces; this began an accretion of provinces and territories and a process of increasing autonomy from the United Kingdom. This widening autonomy was highlighted by the Statute of Westminster of 1931 and culminated in the Canada Act of 1982, which severed the vestiges of legal dependence on the British parliament. Canada is a parliamentary democracy and a constitutional monarchy in the Westminster tradition, with Elizabeth II as its queen and a prime minister who serves as the chair of the federal cabinet and head of government; the country is a realm within the Commonwealth of Nations, a member of the Francophonie and bilingual at the federal level. It ranks among the highest in international measurements of government transparency, civil liberties, quality of life, economic freedom, education.
It is one of the world's most ethnically diverse and multicultural nations, the product of large-scale immigration from many other countries. Canada's long and complex relationship with the United States has had a significant impact on its economy and culture. A developed country, Canada has the sixteenth-highest nominal per capita income globally as well as the twelfth-highest ranking in the Human Development Index, its advanced economy is the tenth-largest in the world, relying chiefly upon its abundant natural resources and well-developed international trade networks. Canada is part of several major international and intergovernmental institutions or groupings including the United Nations, the North Atlantic Treaty Organization, the G7, the Group of Ten, the G20, the North American Free Trade Agreement and the Asia-Pacific Economic Cooperation forum. While a variety of theories have been postulated for the etymological origins of Canada, the name is now accepted as coming from the St. Lawrence Iroquoian word kanata, meaning "village" or "settlement".
In 1535, indigenous inhabitants of the present-day Quebec City region used the word to direct French explorer Jacques Cartier to the village of Stadacona. Cartier used the word Canada to refer not only to that particular village but to the entire area subject to Donnacona. From the 16th to the early 18th century "Canada" referred to the part of New France that lay along the Saint Lawrence River. In 1791, the area became two British colonies called Upper Canada and Lower Canada collectively named the Canadas. Upon Confederation in 1867, Canada was adopted as the legal name for the new country at the London Conference, the word Dominion was conferred as the country's title. By the 1950s, the term Dominion of Canada was no longer used by the United Kingdom, which considered Canada a "Realm of the Commonwealth"; the government of Louis St. Laurent ended the practice of using'Dominion' in the Statutes of Canada in 1951. In 1982, the passage of the Canada Act, bringing the Constitution of Canada under Canadian control, referred only to Canada, that year the name of the national holiday was changed from Dominion Day to Canada Day.
The term Dominion was used to distinguish the federal government from the provinces, though after the Second World War the term federal had replaced dominion. Indigenous peoples in present-day Canada include the First Nations, Métis, the last being a mixed-blood people who originated in the mid-17th century when First Nations and Inuit people married European settlers; the term "Aboriginal" as a collective noun is a specific term of art used in some legal documents, including the Constitution Act 1982. The first inhabitants of North America are hypothesized to have migrated from Siberia by way of the Bering land bridge and arrived at least 14,000 years ago; the Paleo-Indian archeological sites at Old Crow Flats and Bluefish Caves are two of the oldest sites of human habitation in Canada. The characteristics of Canadian indigenous societies included permanent settlements, complex societal hierarchies, trading networks; some of these cultures had collapsed by the time European explorers arrived in the late 15th and early 16th centuries and have only been discovered through archeological investigations.
The indigenous population at the time of the first European settlements is estimated to have been between 200,000
The system of imperial units or the imperial system is the system of units first defined in the British Weights and Measures Act of 1824, refined and reduced. The Imperial units replaced the Winchester Standards, which were in effect from 1588 to 1825; the system came into official use across the British Empire. By the late 20th century, most nations of the former empire had adopted the metric system as their main system of measurement, although some imperial units are still used in the United Kingdom and other countries part of the British Empire; the imperial system developed from what were first known as English units, as did the related system of United States customary units. The Weights and Measures Act of 1824 was scheduled to go into effect on 1 May 1825. However, the Weights and Measures Act of 1825 pushed back the date to 1 January 1826; the 1824 Act allowed the continued use of pre-imperial units provided that they were customary known, marked with imperial equivalents. Apothecaries' units are mentioned neither in the act of 1824 nor 1825.
At the time, apothecaries' weights and measures were regulated "in England and Berwick-upon-Tweed" by the London College of Physicians, in Ireland by the Dublin College of Physicians. In Scotland, apothecaries' units were unofficially regulated by the Edinburgh College of Physicians; the three colleges published, at infrequent intervals, the London and Dublin editions having the force of law. Imperial apothecaries' measures, based on the imperial pint of 20 fluid ounces, were introduced by the publication of the London Pharmacopoeia of 1836, the Edinburgh Pharmacopoeia of 1839, the Dublin Pharmacopoeia of 1850; the Medical Act of 1858 transferred to The Crown the right to publish the official pharmacopoeia and to regulate apothecaries' weights and measures. Metric equivalents in this article assume the latest official definition. Before this date, the most precise measurement of the imperial Standard Yard was 0.914398415 metres. In 1824, the various different gallons in use in the British Empire were replaced by the imperial gallon, a unit close in volume to the ale gallon.
It was defined as the volume of 10 pounds of distilled water weighed in air with brass weights with the barometer standing at 30 inches of mercury at a temperature of 62 °F. In 1963, the gallon was redefined as the volume of 10 pounds of distilled water of density 0.998859 g/mL weighed in air of density 0.001217 g/mL against weights of density 8.136 g/mL, which works out to 4.546096 l or 277.4198 cu in. The Weights and Measures Act of 1985 switched to a gallon of 4.54609 L. These measurements were in use from 1826, when the new imperial gallon was defined, but were abolished in the United Kingdom on 1 January 1971. In the US, though no longer recommended, the apothecaries' system is still used in medicine in prescriptions for older medications. In the 19th and 20th centuries, the UK used three different systems for weight. Troy weight, used for precious metals; the distinction between mass and weight is not always drawn. A pound is a unit of mass, although it is referred to as a weight; when a distinction is necessary, the term pound-force may be used to refer to a unit of force rather than mass.
The troy pound was made the primary unit of mass by the 1824 Act. The Weights and Measures Act 1855 made the avoirdupois pound the primary unit of mass. In all the systems, the fundamental unit is the pound, all other units are defined as fractions or multiples of it. Although the 1824 act defined the yard and pound by reference to the prototype standards, it defined the values of certain physical constants, to make provision for re-creation of the standards if they were to be damaged. For the yard, the length of a pendulum beating seconds at the latitude of Greenwich at Mean Sea Level in vacuo was defined as 39.01393 inches. For the pound, the mass of a cubic inch of distilled water at an atmospheric pressure of 30 inches of mercury and a temperature of 62° Fahrenheit was defined as 252.458 grains, with there being 7,000 grains per pound. However, following the destruction of the original prototypes in the 1834 Houses of Parliament fire, it proved impossible to recreate the standards from these definitions, a new Weights and Measures Act was passed in 1855 which permitted the recreation of the prototypes from recognized secondary standards.
The imperial system is one of many systems of English units. Although most of the units are defined in more than one system, some subsidiary units were used to a much greater extent, or for different purposes, in one area rather than the other; the distinctions between these systems are not drawn precisely. One such distinction is that between these systems and older British/English units/systems or newer additions; the term imperial should not be applied to English units that were outlawed in the Weights and Measures Act 1824 or earlier, or which had fallen out of use by that time, nor to post-imperial inventions, such as the slug or poundal. The US customary system is derived from the English units that were in use at the time of settlement; because the United States was independent at the time, these units were unaffected b
The metric system is an internationally recognised decimalised system of measurement. It is in widespread use, where it is adopted, it is the only or most common system of weights and measures, it is now known as the International System of Units. It is used to measure everyday things such as the mass of a sack of flour, the height of a person, the speed of a car, the volume of fuel in its tank, it is used in science and trade. In its modern form, it consists of a set of base units including metre for length, kilogram for mass, second for time and ampere for electrical current, a few others, which together with their derived units, can measure any physical quantity. Metric system may refer to other systems of related base and derived units defined before the middle of the 20th century, some of which are still in limited use today; the metric system was designed to have properties that make it easy to use and applicable, including units based on the natural world, decimal ratios, prefixes for multiples and sub-multiples, a structure of base and derived units.
It is a coherent system, which means that its units do not introduce conversion factors not present in equations relating quantities. It has a property called rationalisation that eliminates certain constants of proportionality in equations of physics; the units of the metric system taken from observable features of nature, are now defined by phenomena such as the microwave frequency of a caesium atomic clock which measures seconds. One unit, the kilogram, remains defined in terms of a man-made artefact, but scientists voted to change the definition to one based on Planck's constant via a Kibble balance; the new definition is expected to be formally propagated on 20 May 2019. While there are numerous named derived units of the metric system, such as watt and lumen, other common quantities such as velocity and acceleration do not have their own unit, but are defined in terms of existing base and derived units such as metres per second for velocity. Though other or widespread systems of weights and measures continue to exist, such as the British imperial system and the US customary system of weights and measures, in those systems most or all of the units are now defined in terms of the metric system, such as the US foot, now a defined decimal fraction of a metre.
The metric system is extensible, new base and derived units are defined as needed in fields such as radiology and chemistry. The most recent derived unit, the katal, for catalytic activity, was added in 1999. Recent changes are directed toward defining base units in terms of invariant constants of physics to provide more precise realisations of units for advances in science and industry; the modern metric system consists of four electromechanical base units representing seven fundamental dimensions of measure: length, time, thermodynamic temperature, luminous intensity, quantity of substance. The units are: the metre for length kilogram for mass second for time ampere for electromagnetism kelvin for temperature candela for luminous intensity mole for quantityTogether they are sufficient for measuring any known quantity, without reference to further quantities or phenomena; the metre, ampere and mole are all defined in terms of other base units. For example, the speed of light is defined as 299,792,458 metres per second, the metre is derived from that constant and the definition of a second.
As a result, in dimensional analysis, they remain wholly separate concepts. There are 22 derived units with special names in the metric system, these are defined in terms of the base units or other named derived units. Eight of these units are electromagnetic quantities: volt, a unit of electrical potential ohm, a unit of electrical resistance tesla, a unit of magnetic flux density weber, a unit of magnetic flux farad, a unit of electrical capacitance henry, a unit of electrical inductance siemens, a unit of electrical conductance coulomb, a unit of electrical chargeFour of these units are mechanical quantities: watt, a unit of mechanical or electrical power newton, a unit of mechanical force joule, a unit of mechanical, electrical or thermodynamic energy pascal, a unit of pressureFive units represent measures of electromagnetic radiation and radioactivity: becquerel, a unit of radioactive decay sievert, a unit of absorbed ionising radiation gray, a unit of ionising radiation lux, a unit of luminous flux lumen, a unit of luminous intensityTwo units are measures of circular arcs and spherical surfaces: radian, a unit of circular arc steradian, a unit of spherical surface areaThree units are miscellaneous: degree Celsius, a unit of thermodynamic temperature katal, a unit of catalytic activity hertz, a unit of cycles per second Although SI, as published by the CGPM, should, in theory, meet all the requirements of commerce and technology, certain customary units of measure have acquired established positions within the world community.
In order that such units are used around the world, the CGPM catalogued such units in Tables 6 to 9 of the SI brochure. These categories are: Non-SI units accepted for use with the International System of Units; this list includes the hour and minute, the angular measures, the historic metric units, the litre and hectare Non-SI units whose values in SI units must be obtained experimentally. This list includes various units of measure used in atomic and nuclear physics and in astronomy such as the dalton, the electron mass, the electron volt, the astronomical unit
Popular Mechanics is a magazine of popular science and technology, featuring automotive, outdoor, science, do-it-yourself, technology topics. Military topics and transportation of all types, space and gadgets are featured, it was founded in 1902 by Henry Haven Windsor, the editor and—as owner of the Popular Mechanics Company—the publisher. For decades, the tagline of the monthly magazine was "Written so you can understand it." In 1958, PM was purchased by the Hearst Corporation, now Hearst Communications. In 2013, the US edition changed from twelve to ten issues per year, in 2014 the tagline was changed to "How your world works." The magazine added a podcast in recent years, including regular features Most Useful Podcast Ever and How Your World Works. Popular Mechanics was founded in Chicago by Henry Haven Windsor, with the first issue dated January 11, 1902, his concept was that it would explain "the way the world works" in plain language, with photos and illustrations to aid comprehension. For decades, its tagline was "Written so you can understand it."
The magazine was a weekly until September 1902. The Popular Mechanics Company was owned by the Windsor family and printed in Chicago until the Hearst Corporation purchased the magazine in 1958. In 1962, the editorial offices moved to New York City. From the first issue, the magazine featured a large illustration of a technological subject, a look that evolved into the magazine's characteristic full-page, full-color illustration and a small 6.5" x 9.5" trim size beginning with the July, 1911 issue. It maintained the small format until 1975. Popular Science adopted full-color cover illustrations in 1915, the look was imitated by technology magazines. Several international editions were introduced after World War II, starting with a French edition, followed by Spanish in 1947, Swedish and Danish in 1949. In 2002, the print magazine was being published in English and Spanish and distributed worldwide. South African and Russian editions were introduced that same year. Notable articles have been contributed by notable people including Guglielmo Marconi, Thomas Edison, Jules Verne, Barney Oldfield, Knute Rockne, Winston Churchill, Charles Kettering, Tom Wolfe, Buzz Aldrin, as well as many presidents including Teddy Roosevelt and Ronald Reagan.
Comedian and car expert Jay Leno had a regular column, Jay Leno's Garage, starting in March, 1999. * Note. For decades, the lead time to go from submission to print was three months, so some of the dates might not correspond with employment dates; as the Popular Mechanics web site has become more dominant and the importance of print issues has declined, editorial changes have more immediate impact. 1986 National Magazine Award in the Leisure Interest category for the Popular Mechanics Woodworking Guide, November 1986. 2008 National Magazine Award in the Personal Service category for its "Know Your Footprint: Energy and Waste" series. The magazine has received eight National Magazine Award nominations, including 2012 nominations in the Magazine of the Year category and the General Excellence category. Israel, Paul B.. "Enthusiasts and Innovators:'Possible Dreams' and the'Innovation Station' at the Henry Ford Museum". Technology and Culture. 35: 396–401. Doi:10.2307/3106308. JSTOR 3106308. Wright, John L..
Possible Dreams: Enthusiasm for Technology in America. Henry Ford Museum and Greenfield Village. P. 128. ISBN 978-0-933728-35-6. Bryant, Margaret M.. "New Words from Popular Mechanics". American Speech. 52: 39–46. Doi:10.2307/454718. JSTOR 454718. A nearly complete archive of Popular Mechanics issues from 1905 through 2005 is available through Google Books. Popular Mechanics' cover art is the subject of Tom Burns' 2015 Texas Tech PhD dissertation, titled Useful fictions: How Popular Mechanics builds technological literacy through magazine cover illustration. Darren Orr wrote an analysis of the state of Popular Mechanics in 2014 as partial fulfillment of requirements for a master's degree in journalism from University of Missouri-Columbia. Popularmechanics.com Google Books archive Popular Mechanics South African edition Works by Popular Mechanics at Project Gutenberg Works by or about Popular Mechanics at Internet Archive Works by or about Popular Mechanics at Google Books