Rare Books
Notes on proposed improvement in hydraulic mining
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a. Hydraulic Gold Mine
Manuscripts
The collection contains letters, documents, including 190,000 reports, 1200 maps, 500 photographs, and 8200 pieces of printed material related to the life and career of Ralph Arnold. Subjects represented in the collection include: mining, petroleum, and seismology in the Western United States as well as Canada, Mexico, Cuba, and South America; political papers from 1914 to 1956, mostly concerning the campaign of Herbert Hoover for president; family and personal papers from 1836 to 1961 of Arnold and his father, Delos Arnold, containing source material on Pasadena and Southern California local history. The collection also contains Arnold's field books, including those made at Stanford University with the U.S. Geological Survey from 1900 to 1909.
mssArnold
Hydraulic Method of Mining
Rare Books
Image is of water falling from a high cliff in the background into wooden canals, a miner at the left using a hose coming from a hydraulic telegraph on the hill above to wash earth into a canal in the center, and another mining working in the canal. "C. Nahl. W. C. Butler, Engraver."--text, within bottom of image. Paper color: blue.
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