Price list of drawing materials, architects and engineers, supplies, blue process papers, etc (1886)
Soltmann, E. G., New York. [from old catalog] · New York, Holt brothers · leaf 120
right. The metal arc holds the angle at anypoint by means of a thumb screw. With this instrument very close shading and hatching can be quickly andcorrectly done. The arc contains lines, and the figures 2, 3, 4, 5, etc. When theangle is set to figure 2, the sections produced are 3^ of the distance… … 8310.8312.8314. This iastrument can be attached to a drawing board, by fastening the clampscrews. As the motion is produced by means of notched wheels, the move-ments are uniform. The ruler may be set at any angle. Printed round dia-grams for various diameters are attached to the wheel B, with…
Drawing instruments
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
