Hall Effect History
The Hall Effect was discovered experimentally by Edwin Hall in 1879. He published it in the American Journal of Mathematics under the title of On a New Action of the Magnet on Electric Currents. At the time Edwin Hall was performing his experiments, electric current was believed to be a continuous fluid. By 1920 the Smithsonian Institute Physical Tables included a table describing the magnitude of the Hall Effect for a number of substances.
In the 1950s Hall Effect transducers to make laboratory type magnetic measurement instruments. Semiconductor materials became more readily available at that enabling the fabrication of high quality transducers.
In the 1960s and 1970s it became possible to build Hall Effect sensors on integrated circuits with on-board signal processing circuitry. Which reduced the cost of using these devices and use became widespread. First uses included computer keyboards. Hall Effect sensors were used to replace mechanical contacts on keyboards, which improved the reliability of keyboards.