File:ZooExcerpt.png
ZooExcerpt.png (564 × 411 pixels, file size: 152 KB, MIME type: image/png)
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Summary
DescriptionZooExcerpt.png |
English: Excerpt of photograph 712B-3, showing 138 kV one-line diagram of Zoo Sub 9, circa 1997. This is part of the electrical supply system for the Amtrak Northeast Corridor railroad line; installed for the Pennsylvania Railroad in 1935 at Thirtieth Street Station, Philadelphia.
The schematic of the 44 kV system has already been removed and covered in black paint or electrical tape. 138 kV circuit breakers, numbered R19 and R29, are designated by the enclosing rectangle. 138 kV circuit breakers are also visible at Perryville, MD; and Thorndale, PA. These locations correspond to the locations of Phase Break indicators. |
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Source |
U.S. Historic American Engineering Record. "View west within the periphery of the load dispatch model board, operator's console is at lower center and button board is at lower right of the photograph; section of model board shown covers substation from Perryman (left) to Frankford (right); instruments at right center of photograph formerly monitored energy usage and were replaced by computerized monitoring system. - Thirtieth Street Station, Load Dispatch Center, Thirtieth & Market Streets, Railroad Station, Amtrak (formerly Pennsylvania Railroad Station), Philadelphia, Philadelphia County, PA."
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Author | Robert C. Stewart, photographer |
Licensing
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This file comes from the Historic American Buildings Survey (HABS), Historic American Engineering Record (HAER) or Historic American Landscapes Survey (HALS). These are programs of the National Park Service established for the purpose of documenting historic places. Records consist of measured drawings, archival photographs, and written reports.
This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing. |
Public domainPublic domainfalsefalse |
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This image or media file contains material based on a work of a National Park Service employee, created as part of that person's official duties. As a work of the U.S. federal government, such work is in the public domain in the United States. See the NPS website and NPS copyright policy for more information. | ![]() |
Original upload log
Transferred from en.wikipedia to Commons by
- 2011-01-02 21:13 Mcg410 564×411× (156039 bytes) Excerpt of photograph 712B-3, showing 138 kV one-line diagram of Zoo Sub 9, circa 1997. Note that 44 kV system is covered in black tape and electrical tape. Library of Congress, Prints & Photographs Division, [http://www.loc.gov/pictures/item/PA3881/ HA
Captions
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1997
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 01:52, 27 October 2012 | ![]() | 564 × 411 (152 KB) | File Upload Bot (Magnus Manske) | Transfered from en.wikipedia by User:Fredlyfish4 using CommonsHelper |
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Horizontal resolution | 1,968.5 dpc |
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Vertical resolution | 1,593.7 dpc |