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The source of the clock's name is unknown. [6] One myth is that the clock was meant to commemorate Ohio's admission to the Union as the 17th state because the shield on the front of the clock's case has seventeen stars in it. However, there is no record that shows the clock celebrates Ohio's statehood and the clock was ordered twelve years ...
The longcase clock (also known as the grandfather clock) was created to house the pendulum and works by the English clockmaker William Clement in 1670 or 1671. It was also at this time that clock cases began to be made of wood and clock faces to use enamel as well as hand-painted ceramics. In 1670, William Clement created the anchor escapement ...
Sometimes inventions are invented by several inventors around the same time, or may be invented in an impractical form many years before another inventor improves the invention into a more practical form. Where there is ambiguity, the date of the first known working version of the invention is used here.
The invention of the candle clock was attributed by the Anglo-Saxons to Alfred the Great, king of Wessex (r. 871–889), who used six candles marked at intervals of one inch (25 mm), each made from 12 pennyweights of wax, and made to be 12 centimetres (4.7 in) in height and of a uniform thickness.
These two types are made by the International Time Recording Co. of New York. [13] An example of this other form of time clock, made by IBM, is pictured. The face shows employee numbers which would be dialed up by employees entering and leaving the factory. The day and time of entry and exit was punched onto cards inside the box. [14]
Haydon invented an improved timer in 1961, a micro-miniature synchronous motor the size of two aspirin tablets U.S. Patent No. 3,113,231 [22] A miniature motor developed by Haydon, less than one inch in diameter and weighing less than two ounces, circled the world in satellites, as reported on May 17, 1964, in the Republican-American. [23] [24]
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The mainspring, invented in the 15th century, allowed small clocks to be built. Leonardo da Vinci produced the earliest drawings of a pendulum while the pendulum clock, designed by Christiaan Huygens in 1656, was more accurate than other mechanical timekeepers. The electric clock, invented in 1840, controlled the most accurate pendulum clocks ...