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 105
in Figs. 208 and209. The first is a flat drill and the second a twist drill. Thelatter is the form in general use. Drills are used in differentforms of machines. Look up the following in the advertisingpages of American Machinist or Machinery: Sensitive Drill,Drill Press, Multiple Drill. 87 88…
Mechanical drawing
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