Methods of machine shop work : for apprentices and students in technical and trade schools (1914)
Halsey, Frederick A. (Frederick Arthur), 1856-1935 · New York : McGraw-Hill · leaf 211
own in Fig. 182, the drill spindle beingalways vertical. Such machines are called plain radials. In ^ To the best of the authors knowledge, the first machine tool of any kind tobe thus driven was a Bickford drilling machine exhibited at the Pan-AmericanExposition of 190D. 199 200 METHODS OF MACHINE… … Fig. 181.—Upright drilling and tapping machine. at any angle with the horizontal and vertical planes Suchmachines are called universal radials. Sometimes one of theseadjustments is omitted and the machine becomes a semi- DRILLING 201 M^f i P^
Machine-shop practice
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