Mean sea level is an average level of the surface of one or more of Earth's oceans from which heights such as elevation may be measured. MSL is a type of vertical datum – a standardised geodetic datum –, used, for example, as a chart datum in cartography and marine navigation, or, in aviation, as the standard sea level at which atmospheric pressure is measured to calibrate altitude and aircraft flight levels. A common and straightforward mean sea-level standard is the midpoint between a mean low and mean high tide at a particular location. Sea levels can be affected by many factors and are known to have varied over geological time scales; however 20th century and current millennium sea level rise is caused by global warming, careful measurement of variations in MSL can offer insights into ongoing climate change. The term above sea level refers to above mean sea level. Precise determination of a "mean sea level" is difficult to achieve because of the many factors that affect sea level. Instantaneous sea level varies quite a lot on several scales of space.
This is because the sea is in constant motion, affected by the tides, atmospheric pressure, local gravitational differences, salinity and so forth. The easiest way this may be calculated is by selecting a location and calculating the mean sea level at that point and use it as a datum. For example, a period of 19 years of hourly level observations may be averaged and used to determine the mean sea level at some measurement point. Still-water level or still-water sea level is the level of the sea with motions such as wind waves averaged out. MSL implies the SWL further averaged over a period of time such that changes due to, e.g. the tides have zero mean. Global MSL refers to a spatial average over the entire ocean. One measures the values of MSL in respect to the land. In the UK, the Ordnance Datum is the mean sea level measured at Newlyn in Cornwall between 1915 and 1921. Prior to 1921, the vertical datum was MSL at the Victoria Liverpool. Since the times of the Russian Empire, in Russia and other former its parts, now independent states, the sea level is measured from the zero level of Kronstadt Sea-Gauge.
In Hong Kong, "mPD" is a surveying term meaning "metres above Principal Datum" and refers to height of 1.230m below the average sea level. In France, the Marégraphe in Marseilles measures continuously the sea level since 1883 and offers the longest collapsed data about the sea level, it is used for main part of Africa as official sea level. As for Spain, the reference to measure heights below or above sea level is placed in Alicante. Elsewhere in Europe vertical elevation references are made to the Amsterdam Peil elevation, which dates back to the 1690s. Satellite altimeters have been making precise measurements of sea level since the launch of TOPEX/Poseidon in 1992. A joint mission of NASA and CNES, TOPEX/Poseidon was followed by Jason-1 in 2001 and the Ocean Surface Topography Mission on the Jason-2 satellite in 2008. Height above mean sea level is the elevation or altitude of an object, relative to the average sea level datum, it is used in aviation, where some heights are recorded and reported with respect to mean sea level, in the atmospheric sciences, land surveying.
An alternative is to base height measurements on an ellipsoid of the entire Earth, what systems such as GPS do. In aviation, the ellipsoid known as World Geodetic System 84 is used to define heights; the alternative is to use a geoid-based vertical datum such as NAVD88. When referring to geographic features such as mountains on a topographic map, variations in elevation are shown by contour lines; the elevation of a mountain denotes the highest point or summit and is illustrated as a small circle on a topographic map with the AMSL height shown in metres, feet or both. In the rare case that a location is below sea level, the elevation AMSL is negative. For one such case, see Amsterdam Airport Schiphol. To extend this definition far from the sea means comparing the local height of the mean sea surface with a "level" reference surface, or geodetic datum, called the geoid. In a state of rest or absence of external forces, the mean sea level would coincide with this geoid surface, being an equipotential surface of the Earth's gravitational field.
In reality, due to currents, air pressure variations and salinity variations, etc. this does not occur, not as a long-term average. The location-dependent, but persistent in time, separation between mean sea level and the geoid is referred to as ocean surface topography, it varies globally in a range of ± 2 m. Adjustments were made to sea-level measurements to take into account the effects of the 235 lunar month Metonic cycle and the 223-month eclipse cycle on the tides. Several terms are used to describe the changing relationships between sea level and dry land; when the term "relative" is used, it means change relative to a fixed point in the sediment pile. The term "eustatic" refers to global changes in sea level relative to a fixed point, such as the centre of the earth, for example as a result of melting ice-caps; the term "steric" refers to global changes in sea level due to thermal expansion and salinity variations. The term "isostatic" refers to changes in
Bok Tower Gardens
Bok Tower Gardens is a contemplative garden, bird sanctuary located north of Lake Wales, United States. It consists of a 250-acre garden, the 205-foot tall Singing Tower with its carillon bells, Pine Ridge Trail, Pinewood Estate, a visitor center; the tower is built upon Iron Mountain, one of the highest points of peninsular Florida, estimated to be 295 feet above sea level. It is a National Historic Landmark, listed on the National Register of Historic Places, nationally significant for its association with Edward W. Bok and its designers. Bok Tower Gardens is open daily and an admission fee is charged; the gardens began in 1921 when a Dutch immigrant, Edward W. Bok, editor of the popular women's magazine Ladies Home Journal and his wife, Mary Louise Curtis Bok, who would found the Curtis Institute of Music in Philadelphia in 1924, were spending the winter beside Florida's Lake Wales Ridge and decided to create a bird sanctuary on its highest hill, 295 feet above sea level. Bok commissioned noted landscape architect Frederick Law Olmsted Jr. to transform what was an arid sandhill into "a spot of beauty second to none in the country".
The first year was spent digging trenches and laying pipes for irrigation, after which soil was brought to the site by thousands of truck loads and plantings began. The Olmsted plan included the planting of 1,000 large live oaks, 10,000 azaleas, 100 sabal palms, 300 magnolias, 500 gordonias, as well as hundreds of fruit shrubs such as blueberry and holly. Attempts were made to introduce flamingos to the sanctuary several times, why early renderings of the tower show flamingos at the reflection pool rather than swans; these early efforts were unsuccessful, however, as the flamingos were not native to central Florida and could not survive the winters that were cooler than those of southern Florida, where they may be found. Under construction for over five years, Bok Tower Gardens was dedicated by President Calvin Coolidge on February 1, 1929. Edward Bok was interred at the base of the tower. Frederick Law Olmsted Jr. designed the meandering gardens of Bok Tower Gardens to feature acres of ferns, oaks and wetland plants.
The plantings include camellias, tree ferns, creeping fig and dahoon holly, Asiatic jasmine, Justicia and spider lily, wax myrtle and sabal palm, philodendron, blue plumbago, horsetail rush. The site is a refuge for more than a hundred bird species. Wild turkey and groups of sandhill cranes are often seen wandering the grounds; the Singing Tower is the centerpiece of the gardens. The tower was built at the highest elevation of the site, south of a reflection pool that allows the water to reflect its full image. A 60-bell carillon set within the 205-foot tall, Gothic Revival and Art Deco tower, designed by architect Milton B. Medary. Construction on the tower began in 1927 and was completed for the dedication of the gardens in 1929, when it was dedicated by President Calvin Coolidge; the tower is 51 feet square at its base, changing form at 150 feet high to an octagon with 37 feet sides that include sculptures designed by Lee Lawrie. The tower is surrounded by a 15-foot moat, it is built of pink Etowah marble and gray Creole marble, mined in Tate and coquina stone from St. Augustine, Florida.
Although the tower's interior is not open to the public, it contains the Anton Brees Carillon Library, said to be the largest carillon library in the world. It is home to the Chao Research Center Archives, which keeps various institutional records related to Bok Tower. Inside the bell chamber is a playing room that houses a clavier, or keyboard, used for playing the carillon bells. Recitals are given daily from the 60-bell carillon set. Bok Tower Gardens houses a substantial amount of collections that document the history and growth of the Singing tower, the Gardens, Pinewood Estate. While many of the collections are closed to the public for viewing, some selections from the archives about the history of the Gardens, Singing Tower, Edward Bok are on display in the Visitor Center; the Anton Brees Carillon Library was established in 1968 after the death of Anton Brees, the beloved first carillonneur of the Singing Tower. The library is located on the fifth floor of the Singing Tower, it is considered to be one of the largest collections of carillon-related materials in the world.
The Anton Brees Carillon Library includes over 1500 books, 200 collections of scores for keyboard instruments, 3000 scores and musical compositions for carillon, 1600 audio and video recordings, 15 international professional journals that include more than 900 individual volumes. The library houses vertical files on international carillons that include newspaper clippings, biographical information and concert programs along with the original blueprints and plans for the Singing Tower and Gardens and thousands of photographs and slides. There are several important collections located in the Anton Brees Carillon Library, including the Guild of Carillonneurs in North America Archives, Ronald Barnes Collection, Anton Brees Collection, Sidney Giles Collection and Arthur Bigelow Collection. Access to the collections in the Anton Brees Carillon Library is available by appointment only. To make an appointment, the Bok Tower librarian should be contacted; the Chao Research Center Archives was formed in 2008, after a generous donation made by the Ting Tsung and Wei Fong Chao Foundation.
With this donation, space was made available on the second floor of the Singing Tower to accommodate a growing need for delicate ar
National Register of Historic Places
The National Register of Historic Places is the United States federal government's official list of districts, buildings and objects deemed worthy of preservation for their historical significance. A property listed in the National Register, or located within a National Register Historic District, may qualify for tax incentives derived from the total value of expenses incurred preserving the property; the passage of the National Historic Preservation Act in 1966 established the National Register and the process for adding properties to it. Of the more than one million properties on the National Register, 80,000 are listed individually; the remainder are contributing resources within historic districts. For most of its history the National Register has been administered by the National Park Service, an agency within the United States Department of the Interior, its goals are to help property owners and interest groups, such as the National Trust for Historic Preservation, coordinate and protect historic sites in the United States.
While National Register listings are symbolic, their recognition of significance provides some financial incentive to owners of listed properties. Protection of the property is not guaranteed. During the nomination process, the property is evaluated in terms of the four criteria for inclusion on the National Register of Historic Places; the application of those criteria has been the subject of criticism by academics of history and preservation, as well as the public and politicians. Historic sites outside the country proper, but associated with the United States are listed. Properties can be nominated in a variety of forms, including individual properties, historic districts, multiple property submissions; the Register categorizes general listings into one of five types of properties: district, structure, building, or object. National Register Historic Districts are defined geographical areas consisting of contributing and non-contributing properties; some properties are added automatically to the National Register when they become administered by the National Park Service.
These include National Historic Landmarks, National Historic Sites, National Historical Parks, National Military Parks, National Memorials, some National Monuments. On October 15, 1966, the Historic Preservation Act created the National Register of Historic Places and the corresponding State Historic Preservation Offices; the National Register consisted of the National Historic Landmarks designated before the Register's creation, as well as any other historic sites in the National Park system. Approval of the act, amended in 1980 and 1992, represented the first time the United States had a broad-based historic preservation policy; the 1966 act required those agencies to work in conjunction with the SHPO and an independent federal agency, the Advisory Council on Historic Preservation, to confront adverse effects of federal activities on historic preservation. To administer the newly created National Register of Historic Places, the National Park Service of the U. S. Department of the Interior, with director George B.
Hartzog Jr. established an administrative division named the Office of Archeology and Historic Preservation. Hartzog charged OAHP with creating the National Register program mandated by the 1966 law. Ernest Connally was the Office's first director. Within OAHP new divisions were created to deal with the National Register; the division administered several existing programs, including the Historic Sites Survey and the Historic American Buildings Survey, as well as the new National Register and Historic Preservation Fund. The first official Keeper of the Register was an architectural historian. During the Register's earliest years in the late 1960s and early 1970s, organization was lax and SHPOs were small and underfunded. However, funds were still being supplied for the Historic Preservation Fund to provide matching grants-in-aid to listed property owners, first for house museums and institutional buildings, but for commercial structures as well. A few years in 1979, the NPS history programs affiliated with both the U.
S. National Parks system and the National Register were categorized formally into two "Assistant Directorates." Established were the Assistant Directorate for Archeology and Historic Preservation and the Assistant Directorate for Park Historic Preservation. From 1978 until 1981, the main agency for the National Register was the Heritage Conservation and Recreation Service of the United States Department of the Interior. In February 1983, the two assistant directorates were merged to promote efficiency and recognize the interdependency of their programs. Jerry L. Rogers was selected to direct this newly merged associate directorate, he was described as a skilled administrator, sensitive to the need for the NPS to work with SHPOs, local governments. Although not described in detail in the 1966 act, SHPOs became integral to the process of listing properties on the National Register; the 1980 amendments of the 1966 law further defined the responsibilities of SHPOs concerning the National Register.
Several 1992 amendments of the NHPA added a category to the National Register, known as Traditional Cultural Properties: those properties associated with Native American or Hawaiian groups
Florida is the southernmost contiguous state in the United States. The state is bordered to the west by the Gulf of Mexico, to the northwest by Alabama, to the north by Georgia, to the east by the Atlantic Ocean, to the south by the Straits of Florida. Florida is the 22nd-most extensive, the 3rd-most populous, the 8th-most densely populated of the U. S. states. Jacksonville is the most populous municipality in the state and the largest city by area in the contiguous United States; the Miami metropolitan area is Florida's most populous urban area. Tallahassee is the state's capital. Florida's $1.0 trillion economy is the fourth largest in the United States. If it were a country, Florida would be the 16th largest economy in the world, the 58th most populous as of 2018. In 2017, Florida's per capita personal income was ranking 26th in the nation; the unemployment rate in September 2018 was 3.5% and ranked as the 18th in the United States. Florida exports nearly $55 billion in goods made in the 8th highest among all states.
The Miami Metropolitan Area is by far the largest urban economy in Florida and the 12th largest in the United States with a GDP of $344.9 billion as of 2017. This is more than twice the number of the next metro area, the Tampa Bay Area, which has a GDP of $145.3 billion. Florida is home to 51 of the world's billionaires with most of them residing in South Florida; the first European contact was made in 1513 by Spanish explorer Juan Ponce de León, who called it la Florida upon landing there in the Easter season, known in Spanish as Pascua Florida. Florida was a challenge for the European colonial powers before it gained statehood in the United States in 1845, it was a principal location of the Seminole Wars against the Native Americans, racial segregation after the American Civil War. Today, Florida is distinctive for its large Cuban expatriate community and high population growth, as well as for its increasing environmental issues; the state's economy relies on tourism and transportation, which developed in the late 19th century.
Florida is renowned for amusement parks, orange crops, winter vegetables, the Kennedy Space Center, as a popular destination for retirees. Florida is the flattest state in the United States. Lake Okeechobee is the largest freshwater lake in the U. S. state of Florida. Florida's close proximity to the ocean influences many aspects of daily life. Florida is a reflection of multiple inheritance. Florida has attracted many writers such as Marjorie Kinnan Rawlings, Ernest Hemingway and Tennessee Williams, continues to attract celebrities and athletes, it is internationally known for golf, auto racing, water sports. Several beaches in Florida have emerald-colored coastal waters. About two-thirds of Florida occupies a peninsula between the Gulf of the Atlantic Ocean. Florida has the longest coastline in the contiguous United States 1,350 miles, not including the contribution of the many barrier islands. Florida has a total of 4,510 islands; this is the second-highest number of islands of any state of the United States.
It is the only state that borders both the Gulf of the Atlantic Ocean. Much of the state is characterized by sedimentary soil. Florida has the lowest high point of any U. S. state. The climate varies from subtropical in the north to tropical in the south; the American alligator, American crocodile, American flamingo, Roseate spoonbill, Florida panther, bottlenose dolphin, manatee can be found in Everglades National Park in the southern part of the state. Along with Hawaii, Florida is one of only two states that has a tropical climate, is the only continental state with either a tropical climate or a coral reef; the Florida Reef is the only living coral barrier reef in the continental United States, the third-largest coral barrier reef system in the world. By the 16th century, the earliest time for which there is a historical record, major Native American groups included the Apalachee of the Florida Panhandle, the Timucua of northern and central Florida, the Ais of the central Atlantic coast, the Tocobaga of the Tampa Bay area, the Calusa of southwest Florida and the Tequesta of the southeastern coast.
Florida was the first region of the continental United States to be visited and settled by Europeans. The earliest known European explorers came with the Spanish conquistador Juan Ponce de León. Ponce de León spotted and landed on the peninsula on April 2, 1513, he named the region Florida. The story that he was searching for the Fountain of Youth is mythical and only appeared long after his death. In May 1539, Conquistador Hernando de Soto skirted the coast of Florida, searching for a deep harbor to land, he described seeing a thick wall of red mangroves spread mile after mile, some reaching as high as 70 feet, with intertwined and elevated roots making landing difficult. The Spanish introduced Christianity, horses, the Castilian language, more to Florida. Spain established several settlements with varying degrees of success. In 1559, Don Tristán de Luna y Arellano established a settlement at present-day Pensacola, making it the first attempted settlement in Florida, but it was abandoned by 1561.
In 1565, the settlement of St. Augustine was established under the leadership of admiral and
The Wall Street Journal
The Wall Street Journal is a U. S. business-focused, English-language international daily newspaper based in New York City. The Journal, along with its Asian and European editions, is published six days a week by Dow Jones & Company, a division of News Corp; the newspaper is published in online. The Journal has been printed continuously since its inception on July 8, 1889, by Charles Dow, Edward Jones, Charles Bergstresser; the Wall Street Journal is one of the largest newspapers in the United States by circulation, with a circulation of about 2.475 million copies as of June 2018, compared with USA Today's 1.7 million. The Journal publishes the luxury news and lifestyle magazine WSJ, launched as a quarterly but expanded to 12 issues as of 2014. An online version was launched in 1996, accessible only to subscribers since it began; the newspaper is notable for its award-winning news coverage, has won 37 Pulitzer Prizes. The editorial pages of the Journal are conservative in their position. The"Journal" editorial board has promoted fringe views on the science of climate change, acid rain, ozone depletion, as well as on the health harms of second-hand smoke and asbestos.
The first products of Dow Jones & Company, the publisher of the Journal, were brief news bulletins, nicknamed "flimsies", hand-delivered throughout the day to traders at the stock exchange in the early 1880s. They were aggregated in a printed daily summary called the Customers' Afternoon Letter. Reporters Charles Dow, Edward Jones, Charles Bergstresser converted this into The Wall Street Journal, published for the first time on July 8, 1889, began delivery of the Dow Jones News Service via telegraph. In 1896, The "Dow Jones Industrial Average" was launched, it was the first of several indices of bond prices on the New York Stock Exchange. In 1899, the Journal's Review & Outlook column, which still runs today, appeared for the first time written by Charles Dow. Journalist Clarence Barron purchased control of the company for US$130,000 in 1902. Barron and his predecessors were credited with creating an atmosphere of fearless, independent financial reporting—a novelty in the early days of business journalism.
In 1921, Barron's, the United States's premier financial weekly, was founded. Barron died in 1928, a year before Black Tuesday, the stock market crash that affected the Great Depression in the United States. Barron's descendants, the Bancroft family, would continue to control the company until 2007; the Journal took its modern shape and prominence in the 1940s, a time of industrial expansion for the United States and its financial institutions in New York. Bernard Kilgore was named managing editor of the paper in 1941, company CEO in 1945 compiling a 25-year career as the head of the Journal. Kilgore was the architect of the paper's iconic front-page design, with its "What's News" digest, its national distribution strategy, which brought the paper's circulation from 33,000 in 1941 to 1.1 million at the time of Kilgore's death in 1967. Under Kilgore, in 1947, the paper won its first Pulitzer Prize for William Henry Grimes's editorials. In 1967, Dow Jones Newswires began a major expansion outside of the United States that put journalists in every major financial center in Europe, Latin America and Africa.
In 1970, Dow Jones bought the Ottaway newspaper chain, which at the time comprised nine dailies and three Sunday newspapers. The name was changed to "Dow Jones Local Media Group".1971 to 1997 brought about a series of launches and joint ventures, including "Factiva", The Wall Street Journal Asia, The Wall Street Journal Europe, the WSJ.com website, Dow Jones Indexes, MarketWatch, "WSJ Weekend Edition". In 2007, News Corp. acquired Dow Jones. WSJ. A luxury lifestyle magazine, was launched in 2008. A complement to the print newspaper, The Wall Street Journal Online, was launched in 1996 and has allowed access only by subscription from the beginning. In 2003, Dow Jones began to integrate reporting of the Journal's print and online subscribers together in Audit Bureau of Circulations statements. In 2007, it was believed to be the largest paid-subscription news site on the Web, with 980,000 paid subscribers. Since online subscribership has fallen, due in part to rising subscription costs, was reported at 400,000 in March 2010.
In May 2008, an annual subscription to the online edition of The Wall Street Journal cost $119 for those who do not have subscriptions to the print edition. By June 2013, the monthly cost for a subscription to the online edition was $22.99, or $275.88 annually, excluding introductory offers. On November 30, 2004, Oasys Mobile and The Wall Street Journal released an app that would allow users to access content from the Wall Street Journal Online via their mobile phones. Many of The Wall Street Journal news stories are available through free online newspapers that subscribe to the Dow Jones syndicate. Pulitzer Prize–winning stories from 1995 are available free on the Pulitzer web site. In September 2005, the Journal launched a weekend edition, delivered to all subscribers, which marked a return to Saturday publication after a lapse of some 50 years; the move was designed in part to attract more consumer advertising. In 2005, the Journal reported a readership profile of about 60 percent top management, an average income of $191,000, an average household net worth of $2.1 million, an average age of 55.
In 2007, the Journal launched a worldwide expansion of its website to include major foreign-language editions. The p
A gravity hill known as a magnetic hill, mystery hill, mystery spot, gravity road, or anti-gravity hill, is a place where the layout of the surrounding land produces an optical illusion, making a slight downhill slope appear to be an uphill slope. Thus, a car left out of gear will appear to be rolling uphill against gravity. There are hundreds of recognised gravity hills around the world; the slope of gravity hills is an optical illusion, although sites are accompanied by claims that magnetic or supernatural forces are at work. The most important factor contributing to the illusion is a or obstructed horizon. Without a horizon, it becomes difficult to judge the slope of a surface as a reliable reference is missing. Objects which one would assume to be more or less perpendicular to the ground, such as trees, may be leaning, offsetting the visual reference; the illusion is similar to the Ames room, in which objects can appear to roll against gravity. A similar phenomenon—an uphill road that appears flat—is known in bicycle racing as a "false flat".
List of gravity hills The Crooked House – a building with an internal gravity hill optical illusion