Single Scale Ruler
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The flat scales are more convenient than the scales on the stick due to the delay in finding the correct scale.
Source
French, Thomas E A Manual of Engineering Drawing for Students and Draftsmen (New York, NY: McGraw-Hill, 1911)
Downloads
2400×419, 134.7 KiB
1024×178, 22.3 KiB
640×111, 11.9 KiB
320×55, 4.7 KiB