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Illustrated catalogue of Wadsworth, Howland & Co. : importers and dealers in artists' supplies and architects' and engineers' stationery. (1885)
Wadsworth, Howland & Co. (Boston, Mass.) · Wadsworth, Howland & Co., Boston · leaf 139
. Protractor, 5^^^ inches diameter, whole circle, half degrees, with Vernier reading to three minutes, . .... 210. Protractor, 8 inches diameter, whole circle, cjuarter degrees, with Vernier reading to one minute, . , . . . . 211. Protractor, 10 inches diameter, whole circle, quarter degrees, with… … No. 214. 214. Square Protractor, 6 inches long, 1^:^ inches wide, whole degrees,with 6 Scales of etjual ]5arts. 4 Scales of Fett and Inches. 2Scales of Chords and Diagonal Scale, ..... 1-75 M Washington & 46 Friend Sts., Boston. 137 No 21 q Square Protractor, 6 inches long, i % inches wide,…Artists' materials · Mathematical instruments
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