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 126
CLINOMETERS. … No. 952 Each. 951. Clinometer, boxwood, jointed, with 2 levels, compass and inclination scale, 6 inch, in leather pocket [case 18 50 952. Same as No. 951, with sights 11 50 The scale marked in these instruments will give the value of angles, as follows: The anglewhich has been ascertained from the…
Drawing instruments
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