Bu. U.S. B. F., 1917-18. PLATE XXXVI. 
Fic. 1.—The original foot-power lathe employed by Mr. Boepple in the inauguration of the fresh-water 
pearl-button industry. (See p. 65.) 
Fic. 2.—A modern automatic machine for shaping and drilling buttons. (See p. 75.) 
