Catalogue and price list of Mackey print paoer co. (1897)
Mackey print paper co., Pittsburg, Pa. [from old catalog] · [Pittsburgh?] · leaf 153
146 TYTTT PITTSBURGH GHICAGO LOGARITHMIC SPIEAL CUEVE Of Hard Rubber and Transparent• • * . Amber. Each. 1998. Hard Eubber Spiral Curve $1.25 1999. Transparent Amber. SpiralCurve 1.75 The above curve is mathematicallycorrect. All curves, withiu its size, canbe made with it.1998 IEEEGrLAE CUETES.
Drawing instruments
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