Appleton's dictionary of machines, mechanics, engine-work, and engineering (1869)
New York, Appleton · leaf 319
/ Take a perfectly straight and even bar of steel, P S, Fig. 2680, sufficiently hard to retain a magneticstate. It may be 7 inches long, gth of an inch wide, and y^th of an inch thick. Drill a clean holethrough the centre of the wide surface, and then pass an extremely fine drill also through the…
Mechanical engineering
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
