. 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 . FAILURE OF HOLLOW TERRA-COTTA TILE FIREPROOFING. A, First story of Spring Valley Water Companys Building, San Francisco (photograph by John Stephen Sewell);/;, Mills Building, San Francisco (photograph by Richard L. Humphrey). The lower webs of the floor tileswere spalled or taken entirely off by the fire. U. S. GEOLOGICAL. 3URVEV BULLETIN NO. 324 PL. XLVI

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