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Parallel Rule with Protractor and Plotting Scale | musefully
Lebbeus Dod. Parallel Rule with Protractor and Plotting Scale, 1796. Brass, wood, Rule: 12 x 1 3/8 in. (30.5 x 3.5 cm)
Case: 12 3/4 x 4 5/8 in. (32.4 x 11.7 cm). Purchase, Anna Glen B. Vietor Gift, in memory of her husband, Alexander Orr Vietor, 1985, (Photo: The Met)