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 137
imb I also attached to the solid center of the Instrument instead of the uppei plate, ss heretofore In tliis Engineers Transit the compass circle is usually solid with the uppei plate; when,however, it is required to set oft the variation oi the needle, the Instrument is made with mova-ble com past… … 982A.No. Each. 98 2 A, Engineers Transit, two verniers to limb, 5-inch needle,but with 6-inch vertical arc on silver, with vernier movedby tangent screw and reading to 30 seconds, level ontelescope, gradienter combined with clamp and tangent.Instrument in box, with tripod, complete $198 00 LIGHT…
Drawing instruments
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