Photographs of the Skagit River Hydroelectric Project constructed between 1918-1961.
<p>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.
</p><p>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, <a rel="nofollow" class="external free" href="http://www.oilhistory.com/pages/Diamond/inventor.html">http://www.oilhistory.com/pages/Diamond/inventor.html</a> and Mining in Manitoba,    <a rel="nofollow" class="external free" href="http://www.digistar.mb.ca/minsci/finding/diamond.htm">http://www.digistar.mb.ca/minsci/finding/diamond.htm</a>]
</p><p>Caption on image: Diamond Drill at Ruby Dam Site. 6-29-19, 5035.
</p><p>PH Coll 1124.32
</p>
<ul><li>Subjects (LCTGM): Rivers--Washington (State)</li>
<li>Subjects (LCSH): Rock-drills--Washington (State); Drilling and boring machinery--Washington (State); Skagit River (B.C. and Wash.)</li></ul>
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Unknown author<span style="display: none;">Unknown author</span></div>
Taken on 29 June 1919
<a rel="nofollow" class="external text" href="https://content.lib.washington.edu/ww-spwsweb/index.html">Seattle Power and Water Supply Collection</a>