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| Title | Scroll case and Larner-Johnson flow control valve in unit no. 1 under construction, Gorge Dam Powerhouse, August 13, 1923 |
| Photographer | Unknown |
| Date | 1923 |
| Notes | Photographs of the Skagit River Hydroelectric Project constructed between 1918-1961.
The Gorge Dam and Powerhouse were built by Seattle City Light and completed in September of 1924.
Water flows from the penstock through the dam and into a spiral "scroll case". Directed through slots on the inner diameter of the scroll case the water falls through the turbine, causing it to spin. Finally the water enters the "draft tube". The larger diameter of this steel outlet tube slows the water before it exits the dam on the downstream side. A Larner-Johnson valve is used to control the outflow of water.
Caption on image: Scroll Case and Johnson Valve, Unit #1, Gorge Plant, 8-13-23. E-5
PH Coll 45.1-53a |
| Location Depicted | United States--Washington (State)--Skagit River--Gorge Dam Powerhouse |
| Subjects (LCSH) | Valves; Hydroelectric power plants--Washington (State)--Design and construction; Larner-Johnson Company |
| Digital Collection | Seattle Power and Water Supply Collection
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| Order Number | WWDL0371 |
| Ordering Information | To order a reproduction, inquire about permissions, or for information about prices see: http://www.lib.washington.edu/specialcollections/services/reproduction-info
Please cite the Order Number when ordering. |
| Repository | University of Washington Libraries. Special Collections Division |
| Repository Collection | Seattle City Light Albums. PH Coll 45
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| Object Type | Photograph |
| Physical Description | silver gelatin, b&w |
| Digital Reproduction Information | Scanned from a photographic print using a Microtek Scanmaker 9600XL at 150 dpi in JPEG format at compression rate 3 and resized to 768x600 ppi. 2005 |
