Capt Field's Improved Parallel Measuring Rule
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Description
"Capt Field's Improved Parallel" brass hinged ruler measures 18" in length when closed and 24" extended and 3" wide. Parallel rules are drawing instruments used to make accurate parallel lines on maps, charts, and architectural drawings. In 1854, English captain William Andrew Field (1796–1871) modified the hinged form of parallel rules, which had been used in Europe since about 1600, by adding scales for 0° to 180°, like those on a protractor, and compass points. These innovations made it easier for ship navigators to move the rule without losing track of the ship's course.
Condition
With minor wear and some scratching and losses as shown.
Buyer's Premium
- 25%
Capt Field's Improved Parallel Measuring Rule
Estimate $50 - $100
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Item located in Valatie, NY, usSee Policy for Shipping
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