Circular Body Measure Tool
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This is a tool used to measure circular bodies, very similar to how current calipers work. This tool features a perpendicular ruler to the circular opening.
Galleries
Measurement ToolsSource
Government Printing Office Official Gazette (Washingon, DC: Government Printing Office, 1912)
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892×2400, 247.7 KiB
380×1024, 38.6 KiB
237×640, 20.2 KiB
118×320, 7.5 KiB