73. Architect's Protractor
Signed: Joshua Kirby Invt. Octr. 5. 1765
Fig. 98
This small silver protractor, with positions for three to twelve-sided
polygons alongside the usual degree scale, illustrates how such
polygonal scales continue to appear on architectural instruments
into the later eighteenth century.
Length: 152 mm
Inventory no. 23,312
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