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 95
556. Circular Protractor, German silver, <r> inch, divided to ».. degree.. 7 00 SWISS PROTRACTORS, Of German Silver. … N3 557No. Each. 557. Circular Protractor, German silver, b% inch, with horn cen- ter and movable arm, divided to % degree, vernier read-ing to 3 minutes $14 00 558. Circular Protractor, German silver, 8 inch, with horn center and movable arm, divided to 34 degree, vernier reading to 1 minute 16 25…
Drawing instruments
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