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| Title | Detail of diamond drill used in early Skagit exploration work, June 29, 1919 |
| Photographer | Unknown |
| Date | 1919 |
| Notes | Photographs of the Skagit River Hydroelectric Project constructed between 1918-1961.
The name of Ruby Dam was changed to Ross Dam in 1939 after the death of J.D. Ross, Seattle City Light Superintendent from 1911-1939, best known for securing and constructing the Skagit River Project.
The diamond core drill, a type of rotary rock drill, was invented by Rodolphe Leschot, a French engineer, in 1863 and patented in the United States the same year. Often used for tunneling and mining work, it consists of an engine that rotates a tube with a diamond cutting edge. [Sources: Oil History by Samuel T. Pees, http://www.oilhistory.com/pages/Diamond/inventor.html and Mining in Manitoba, http://www.digistar.mb.ca/minsci/finding/diamond.htm]
Caption on image: Detail of Diamond Drill. 6-29-19, 5036.
PH Coll 45.235 |
| Location Depicted | United States--Washington (State)--Ross Dam |
| Subjects (LCTGM) | Excavations--Washington (State) |
| Subjects (LCSH) | Rock drill--Washington (State); Drilling and boring machinery--Washington (State) |
| Digital Collection | Seattle Power and Water Supply Collection
|
| Order Number | WWDL0685 |
| 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 115 dpi in JPEG format at compression rate 3 and resized to 768x600 ppi. 2005 |
