Catalogue. A.H. Abbott & co., manufacturers and importers of mathematical and surveying instruments and drawing materials of every description .. (1896)
Abbott, A. H., & co., Chicago. [from old catalog] · [Chicago] · leaf 157
nk or expand equally its whole length and remain straight,which the heads of common squares under like conditions cannot do, beingrigidly fastened to the head. The position of the blade is such that, when necessary to work near thelower edge of the drawing board, a bearing of at least one-half the… … *-ii>^ 1250 No.1250. For schools, micrometer adjustment, brass mountings, cherry ormaple blades, with cherry heads. 18 24 30 36 inch. U 00 1 15 1 20 1 25 each. 151
Drawing instruments
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