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 165
No. 1580. LOGARITHMIC SPIRAL CURVE. … 1580 Logarithmic Spiral Curve Each. U 50 This excellent curve is so constructed as to contain every curve withinits size. The most difficult problems can be solved with the same.Directions accompanying each curve. ADJUSTABLE CURVE RULERS.
Drawing instruments
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