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Hammond Clock Company
The Hammond Clock Company of Chicago, Illinois, produced electric clocks between 1928 and 1941. It was one of the ventures of Laurens Hammond, the inventor of the famous Hammond organ.
==Invention of the Hammond clock motor==
As Stuyvesant Barry reports in his biography of Laurens Hammond,〔See Stuyvesant Barry, ''Hammond as in Organ: The Laurens Hammond Story'', chap. XII: "The Electric Clock." The work remains unpublished but is available on the web at (The Hammond Organ Story ).〕 Hammond himself acknowledged that his invention of the clock that was to bear his name was inspired by the success of Henry Warren's Telechron clocks. Upon discovering the Telechron technology, Hammond designed a motor that was synchronous, like Warren's, that is to say, it rotated at a speed that was tied to the frequency of the current supplied by the power grid. In this way, any clock operated by such a motor would run with great precision as long as the operators of the power grid kept the current's frequency constant. This had become possible since the introduction of the Warren master clock, an innovation of which Hammond took full advantage with his own invention.〔See the article on Telechron for an explanation of the Warren master clock.〕 Hammond's motor, however, differed from Warren's in a number of respects: above all, it ran more slowly and was not self-starting. (Warren had patented his self-starting technology.) The latter Hammond did not consider to be a disadvantage; he believed that people would be misled by their clocks if they restarted automatically after a power outage.〔Warren tried to prevent this problem through his "indicating device," the red dot that would appear on the dial after a power failure. The "indicating device" is explained in the article on Telechron.〕 As Hammond's new clock motor was not self-starting, his clocks possessed a characteristic little knob on the back that one had to spin to start the motor.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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