File:Diamond drill, an early piece of machinery used at Ruby Dam site, June 29, 1919 (SPWS 617).jpg

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Summary[edit]

English: Diamond drill, an early piece of machinery used at Ruby Dam site, June 29, 1919   (Wikidata search (Cirrus search) Wikidata query (SPARQL)  Create new Wikidata item based on this file)
Photographer
Unknown authorUnknown author
Title
English: Diamond drill, an early piece of machinery used at Ruby Dam site, June 29, 1919
Description
English: 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: Diamond Drill at Ruby Dam Site. 6-29-19, 5035.

PH Coll 1124.32

  • Subjects (LCTGM): Rivers--Washington (State)
  • Subjects (LCSH): Rock-drills--Washington (State); Drilling and boring machinery--Washington (State); Skagit River (B.C. and Wash.)
Depicted place
English: United States--Washington (State)--Ruby Dam
Date Taken on 29 June 1919
Medium
English: silver gelatin, b&w
institution QS:P195,Q219563
Current location
University of Washington: Special Collections
Accession number
617
Source
English: Seattle Power and Water Supply Collection
Permission
(Reusing this file)
Public domain
This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.
Order Number
InfoField
WWDL0690

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