Celestia E. Kerr, US665104A
Drawing and Measuring Instrument.
Image credit: Kerr, C.E. (1900)
On January 1, 1901, Celestia E. Kerr of Decatur, Georgia, obtained a patent for a novel drawing and measuring instrument combining multiple tools into a single device. The invention integrated a ruler, T-square, protractor, compass, and adjustable arms with folding and locking features to enable accurate measuring and angle setting.
Date of Application: 18 April 1900
Date of Issuance: 1 January 1901
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Francesca Chiaradia
PhD Candidate in Economics
My research interests include innovation, law, and information economics.