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 166
1593No. Each- 1593. Adjustable Curve Rule U 87 Made of a bar of flexible rubber, to which is attached a bar of lead, withtempered steel spring. Length of whole rule UY2 inches, of rulingedge 10 inches. 1 594. Extra leads for curve ruler No. 1593 12 1595. Adjustable Curve Rule, like No, 1593, but of… … 1600-1602 1 000. Pearwood Splines, 12 to 3(5 inch 15 to These splines are provided with a small groove into which the finger oithe weight is laid, in order to prevent slipping oi the spline. 1601. Hard Rubber Splines. 12 18 24 $0 20 25 25 1 ()02. Lead weights for splines .. 30 35 36 40 1J inch,45…
Drawing instruments
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