A catalogue and price-list of drawing instruments (1892)
Alteneder, Theodore & sons, Philadelphia. [from old catalog] · [Philadelphia, T. Alteneder & sons] · leaf 39
m held rigidly at any part of the circleby means of a shoe and thumb-nut. A spring on this clamping-arm holdsthe vernier-arm against the end of an adjusting-screw, working in asplit-nut also on the clamping-arm. The nut has a clamping-stake up any wear and lost motion. By this arrangement, the arm… … Half Circle. 185 Improved Protractor, ^ Circle j{ Degrees, reading to i minute, 7-inch $20 co 186 Improved Protractor, j4 Circle }( Degrees, reading to 1 minute, 8-inch 22 00 187 Improved Protractor, }4 Circle ^ Degrees, reading to 1 minute, 10-inch 25 00 Whole Circle. 190 Improved Protractor,…
Drawing instruments
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