ON THE STRAINS IN CURVED MASONRY DAMS, by Hubert Vischer and Luther Wagoner. Transcript of an Address read before the Technical Society of the Pacific Coast on November 1, 1889. Disbound, loose signatures, 5.5x8.5 inches, 50 pages (numbered 75 to 124). Disbound from Transactions of the Technical Society of the Pacific Coast, Volume VI, December 1889. Illustrated with charts, graphs and tables. Disbound, loose signatures, rough spine edges where the document was disbound, light age toning, some corner creases from handling, printing remains sharp and clear. Rare original publication on DAM ENGINEERING in general and BEAR VALLEY DAM (Bear Lake, San Bernardino County, California) specifically.