Description and condition:

Blue cloth hardback, dustcover, 8vo, 120pp, index, b/w illustrations.

Very good, slight edgewear, mild foxing and owners details on EPs, else nice clean pages. In poor dustcover with loss, now protected.

Contents:

Brief history of twist drills; the making; drill shanks and tangs; special types; drilling various materials; drilling and working manganese steel as a commercial proposition; the grinding; in use; practical drill hints; drilling with perfect alignment; laws of drill performance; drill design and the future; British standard nomenclature and definitions for twist and straight flute drills. Taping drills. Tables: dimensions of drilling jig bushes.