The Antikythera mechanism is a geared mechanism, believed to have been made by the ancient Greeks, made from bronze in a wooden frame. It was found on 17 May 1902 by archaeologist Spyridon Stais, who was working a shipwreck that had been discovered about 40 metres deep off the Greek island of Antikythera in 1900. Since its discovery, scientists have only been able to theorise over its purpose, as no documentation appears to exist regarding this ancient mechanism. The most widey accepted theory concerning its function is that it was an analog computer designed to model the movements of heavenly objects. Recent working reconstructions of the device support this analysis. The device is all the more impressive for its use of a differential gear, which was previously believed to have only been invented in the 16th century
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It is found in many different areas and the mechanism varies according to where it is found.
( 26 December 1791 - 18 October 1871) Was an English inventor who is perceived to be the originator of the programmable computer. His design of the "analytical" and "difference engines". These devices were designed to calculate logarithmic tables to high levels of accuracy to assist marine navigation. More recently the discovery of the Antikythera mechanism (circa 100-150 a.d.) created at the has called into question of his being the first to create a programmable calculating machine. It may be that these devices have been available for millennia and Babbage was simply the most documented example.
The Loop of Henle
The coarse focusing mechanism is the rough focus knob on the microscope. It is used to move the objective lenses toward or away from the specimen.
It is true that a shifter lock mechanism prevents shifting until the break is depressed.