File:Master clock system.png
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[edit]DescriptionMaster clock system.png |
English: Diagram of a typical master clock system used around 1900 to keep clocks synchronized in factories, schools, and other large institutions. It consists of a precision elecrically-powered master clock with a temperature-compensated mercury pendulum, which is wired to slave clocks all over the building. In addition to wall clocks, it also controls time stamps which are used to stamp documents, and a tower clock which can be used in a clock tower. The "program clock" is a timer which can be programmed with a paper tape punched with holes to ring bells or turn machines off or on at preprogrammed times; up to 8 machines can be controlled. |
Date | |
Source | Downloaded 2011-12-24 from Edwin J. Houston Elementary Electricity in Henry Walter Young, Ed. Popular Electricity and the World's Advance, Vol. 2, No. 1, May 1909, Popular Electricity Publishing Co., Chicago, USA, p. 21 on Google Books |
Author | Edwin J. Houston |
Permission (Reusing this file) |
Public domain - Edwin Houston died in 1914 |
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[edit]Public domainPublic domainfalsefalse |
This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 23:27, 29 December 2011 | 910 × 1,352 (348 KB) | Chetvorno (talk | contribs) |
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Horizontal resolution | 28.35 dpc |
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Vertical resolution | 28.35 dpc |
File change date and time | 19:52, 21 December 2011 |
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