National Museum of American History
Plotting Scale
19th century
On one side this brass rule has an unnumbered scale of chords and architect's scales for making drawings at proportions of 1/5", 1/4", 1/3", 1/2", and 1" to the foot. The other side has 8" plotting scales with diagonal scales at each end. One plotting scale is divided to 1" and numbered by ones from 1 to 8, and the other is divided to 1/2" and numbered by ones from 1 to 16. A badly worn leather sleeve may not be original to the instrument. Compare to 1980.0676.01.
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