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Magnetic stirrer
Videos
A magnetic stirrer or magnetic mixer is a laboratory device that employs a rotating magnetic field to cause a stir bar immersed in a liquid to spin very quickly, thus stirring it. The rotating field m
A stir bar mixing a solution on a combined hot-plate magnetic-stirrer device; the left knob controls the stirring rate and the right knob controls heating
A stir bar mixing a solution on a combined hot-plate magnetic-stirrer device; the left knob controls the stirring rate and the right knob controls hea
Four magnetic stir bars next to a metre stick
Four magnetic stir bars next to a metre stick
Different sizes of magnetic stir bars
Different sizes of magnetic stir bars
Alnico
Videos
Alnico is a family of iron alloys which, in addition to iron, are composed primarily of aluminium, nickel, and cobalt, hence the acronym al-ni-co. They also include copper, and sometimes titanium. Aln
Magnetic stirrer
…to be heated, the power of the heating element, and amount of insulation provided to the system. The magnetic material within bars is most commonly alnico or samarium cobalt, which can withstand high temperatures without loss of magnetic strength, although for low temperature applications neodymium can…
A "horseshoe magnet" made of Alnico 5, about 1 inch high. The metal bar (bottom) is a keeper, which is placed across the poles when the magnet is not
A "horseshoe magnet" made of Alnico 5, about 1 inch high. The metal bar (bottom) is a keeper, which is placed across the poles when the magnet is not in use. This helps to preserve the magnetization.
Alnico 5 magnet used in a magnetron tube in an early microwave oven. About 3 in (8 cm) long.
Alnico 5 magnet used in a magnetron tube in an early microwave oven. About 3 in (8 cm) long.
Advertisement by Jensen Radio Manufacturing Co. for Alnico 5 loudspeakers in 1945. As illustrated, Alnico 5 allowed a dramatic reduction in size and w
Advertisement by Jensen Radio Manufacturing Co. for Alnico 5 loudspeakers in 1945. As illustrated, Alnico 5 allowed a dramatic reduction in size and weight of magnet needed to produce a given flux, from 90 oz in 1930 to 4.6 oz.
Assortment of alnico magnets in 1956. Alnico 5, developed during World War 2, led to a new generation of compact permanent magnet motors and loudspeak
Assortment of alnico magnets in 1956. Alnico 5, developed during World War 2, led to a new generation of compact permanent magnet motors and loudspeakers.