Trigonometer serving as protractor and parallel rule

Made:: 1902-1920 in Ellsworth

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Trigonometer serving as protractor and parallel rule, steel
Science Museum Group
© The Board of Trustees of the Science Museum

Trigonometer serving as protractor and parallel rule, steel, patented 8 April 1902 by the Hagan Company, Ellsworth, Maine

Details

Category:: Mathematics

Object Number:: 1988-127

type:: drawing instruments, combined scale protractors and parallel rules

credit:: Tesseract

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Trigonometer serving as protractor and parallel rule

Details

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