Handbook for machine designers, shop men and draftsmen (1916)
Halsey, Frederick A. (Frederick Arthur), 1856-1935 · New York, McGraw-Hill book company, inc.; [etc., etc.] · leaf 460
Fig. 33.—Incorrect construction of double beat poppet valves. $?$$^^$$§$$$$$$$$$$^S^^^. I 1 … Fig. 34.—Correct construction of double beat poppet valves.
Machine design
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
