A textbook on mechanical and electrical engineering (1902)
International Correspondence Schools · Scranton : International Textbook Co. · leaf 128
■esentzrz.Q Screu/3 m_ T ± … CBAN/6. Wrnuaht Iron^ Fu.llST.eeFintsheaiFt,y /O. diately following the title page. JOHN SMITH. CLASS N9 4-529. § 14 MECHANICAL DRAWING 17 25. Fig. 2 sliows a double square-threaded screw 1^ inches in diameter and with f of an inch pitch. Thereason for using a double thread is that if the single…
