Elementary mechanical drawing, for school and shop (1886)
Aborn, Frank, 1845- [from old catalog] · Cincinnati, New York, Van Antwerp, Bragg & co · leaf 13
Tig. 4. Fig. 5. Set-Square. A Set-Square is an instru-ment in the form of a right-angled triangle (Figs. 4 and 5). … Protractor. A Protractor is an instrument usu-ally in the form ofa semicircular disk,having its periphery Fis- 6« graduated into 180 degrees (Fig. 6). For school work, a protractor made of horn, andthree inches in diameter, is the best. Summary. Two H Faber pencils. One pair Prang School Dividers.…
Mechanical drawing
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
