Wallis, Rolland S. [from old catalog], Iowa state college of agriculture and mechanic arts, Ames. Dept. of engineering extension. [from old catalog] · Ames, Iowa, Engineering extension department, Iowa state college · leaf 22
Fig. 24.—Beam compasse essentially of a bar or beam on which may be clamped suitable attach-ments for holding the needle point and the pen or pencil points lnepen point (c) replaces the pencil point (d) in mkmg; and all thesepoints, including the divider points (b), are interchangeable. A… … Fig. 25.—A simple form of beam compasses. The beam compass is usually manipulated with both hands onesteadying the needle point while the free end is moved with the other.Where the beam is very long the use of a rolling carrler for the tois a convenience, and such an attachment may be obtained foi…
Mechanical drawing
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
