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 136
TRANSITS. No. 981. … Each. Engineers Transit, 5 inch needle, two verniers at an angleof 30° with the telescope and thus in front of the observer,so as to be easily read without a change of position. In-strument in box, with tripod, complete $150 00 982. Engineers Transit, like No. 981, with level to telescopeand clamp…
Drawing instruments
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