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About this collection

Walter Wadsworth Bradley was associated with the California Division of Mines from 1912 to 1946, acting as State Mineralogist from 1928 to 1946. Prior to his association with the Division of Mines, Mr. Bradley had practiced mining engineering in the Mother Lode, in Durango, Mexico, and in Idaho. In addition, he was associate editor of the Mining and Scientific Press. He graduated with the advanced degree of Mining Engineer from the University of California in 1917. Published works by Mr. Bradley covered a wide variety of subjects including ore-dressing, quicksilver resources, manganese, magnesite, and chromium, as well as numerous reports on California mines and mining districts.

 

 

This lantern slide collection (1914 to 1940) documents the various kinds of mines operating during this time in California and the mining techniques associated with their operation. It also includes images of both geographically and geologically significant landmarks in the State. Many of the photographs were subsequently published in the Annual Reports of the State Mineralogist. The lantern slides themselves measure 3.5 tall x 4 wide. As they could be projected onto a flat surface they were primarily used in conjuction with lectures and demonstrations.

 

 
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