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 96
Each. Crozet Protractor, 8 inch, % degrees, with vernier reading to 1 minute, and with tangent screw, polished case $40 00 A very useful instrument, which may be used along a straight edge and angles set off with-out taking the trouble of bringing the center of the protractor over the starting… … 5(JG. Station Pointer, or Three Arm Protractor, t-1 . inch diameter, 17 inch long arms which may be lengthened to21% inch, divided to .] degrees, with verniers on twoouter arms reading to 1 minute, and vernier lens. Inmahogany case s0 00
Drawing instruments
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