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 125
No. Each. 948. Abneys Reflecting Level or Pocket Altimeter, im- proved, with divided arc to show gradients, in morocco case $13 50 949. The same, with compass and socket for Jacob staff 18 00 CLINOMETERS. … 950. Clinometer or Slope Level, of brass, with dividing arc, 9 inches long, folding together, in box 12 00
Drawing instruments
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