. Bulletin of the United States Geological Survey--The San Francisco Earthquake and Fire of April 18, 1906 and their effects on structures and structural materials . MEMORIAL ARCH, LELAND STANFORD JUNIOR UNIVERSITY. A, Before the earthquake (photograph submitted by Richard L. Humphrey); II, Earthquake effect (photo-graph by Richard L. Humphrey). The beams designed to stiffen the walls were not tied to them andhelped to batter them down when the shock came. U. S. GEOLOGICAL SURVEY BULLETIN NO. 324 PL.

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