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 141
TRANSITS. No. 989. … Each. Engineers Transit, like No. 988, but with fine bubble totelescope, graduated on the glass, vertical arc 5 inchdiameter, graduated on silver, with clamp and tangentscrews, with counter spring, needle 4^ inch, horizontallimb 6 inch, verniers at 45°, instrument complete, withplumb bob, in fine…
Drawing instruments
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