Patent Model - Improvement in Trying-Squares
Maker and role
John Richards, Patentee
Jan 26 1864
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18 1/2 x 15 3/4 x 1 1/2" (47 x 40 x 3.8cm)
Richards's patent was intended to "construct an instrument in such a manner that it will indicate the angle of the edge of a piece of stuff, and also indicate when this angle is a right angle, without requiring the workman to raise the piece of stuff from the bench or to stoop to sight along its edge..." (Patent Number 41,396)
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