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Title |
Master Clock |
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Title Caption |
The time standard for the regulation of generator speed is a master clock in the control room of the left powerhouse. The block is driven by energy from a storage battery. A feeble pulsating electric current, generated by a 60-cycle tuning fork, and amplified by vacuum tubes, supplies the clock motor with accurately timed impulses from the storage battery, and thus determines the lock speed. Clock speed controls are shown. |
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Description |
The time standard for the regulation of generator speed is a master clock in the control room of the left powerhouse. The block is driven by energy from a storage battery. A feeble pulsating electric current, generated by a 60-cycle tuning fork, and amplified by vacuum tubes, supplies the clock motor with accurately timed impulses from the storage battery, and thus determines the lock speed. Clock speed controls are shown. |
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Author |
United States. Bureau of Reclamation |
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Library of Congress Subject Headings |
Grand Coulee Dam (Wash.)--Control rooms; Wall clocks--Washington (State)--Grand Coulee Dam |
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TGM Subject |
Control rooms--Washington (State)--Grand Coulee Dam; Time clocks--Washington (State)--Grand Coulee Dam |
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Type |
Image |
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Genre |
Photographs |
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Geographic Area |
United States--Washington (State)--Grant County--Grand Coulee Dam site, Grand Coulee Dam (Wash.) |
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Identifier |
cg040b07v10p233.jpg |
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Date Original |
1942-08-26 |
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Publisher |
Manuscripts, Archives, and Special Collections, Washington State University Libraries: http://www.libraries.wsu.edu/masc/masc.htm |
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Source |
Is found in Cage 40, Frank Arthur Banks Papers, 1913-1957 http://libraries.wsu.edu/masc/finders/cg40.htm at Washington State University Libraries' Manuscripts, Archives, and Special Collections (MASC) http://libraries.wsu.edu/masc |
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Reproduction |
To order a reproduction please see: http://www.libraries.wsu.edu/masc/ , or contact Washington State University Libraries, Manuscripts, Archives, and Special Collections: (509) 335-6691. |
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Rights |
http://rightsstatements.org/vocab/InC/1.0/
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Rights Notes |
In copyright. Item is in copyright for 120 years from its date of creation due to uncertainty of author's date of death.
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Digitization |
Original photographic prints scanned at 24 bit color, with 4000 pixels by the long side, for master TIFF files on an Epson Expression 10,000 XL scanner. Prints were then batch translated into JPEG files. These JPEGs were then added to the CONTENTdm database at WSU Libraries. |
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Language |
English |
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Rating |
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