National Museum of American History
These beveled boxwood rules are faced with white celluloid on the sloping edges. On both rules, one edge is divided to 1/32" and numbered by ones twice. The 18-3/4" rule is numbered from 0 to 36 and from 0 to 18, and the 12-3/4" rule is numbered from 0 to 24 and from 0 to 12.
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