Price list of drawing materials, architects and engineers, supplies, blue process papers, etc (1886)
Soltmann, E. G., New York. [from old catalog] · New York, Holt brothers · leaf 142
No. 10,350. On account of its extreme sensitiveness, the slightest variations in gradients, levels,etc., are easily ascertained, and therefore this instrument is adapted for general miningand surveying. By a new arrangement, the scale of altitude can be subdivided by avernier. The barometrical…
Drawing instruments
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