Essentials of drafting; a text and problem book for apprentice, trade and evening technical schools (1918)
Svensen, Carl L. (Carl Lars), 1884- · New York, D. Van Nostrand company · leaf 113
TIALS OF DRAFTING and where close or frequent adjustment is required. Fig. 253 iscalled a flat key, and requires a flat spot upon the shaft. Itsholding power is a little greater than the preceding form. Setscrews are sometimes used with Figs. 252 and 253 to secure acloser contact. Fig. 254 is the… … F/g. 255Other proportions are Unwin gives
Mechanical drawing
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