![An unusual late 18th-Century brass [?]parallelograph,](https://www.christies.com/img/LotImages/2004/CSK/2004_CSK_09874_0130_000(081534).jpg?w=1)
Details
An unusual late 18th-Century brass [?]parallelograph,
signed THOS JONES'S PATENT NO46 , comprising a square frame constructed with three horizontal bars and five bars at right angles, with four further horizontal bars beneath terminating in a spiked tip arranged to form a straight line between the opposite corners of the frame, a further bar fixed at a 45° angle on the upper face graduated in degrees and inches, the whole arranged to change shape from square to parallelogram, with the graduated bar pierced along its length to accomodate a clamp screw with small graduated vernier, the corners of the frame punched A, O, B and 8, and three of the bars stamped D, 2 and 6 -- 11cm. (4 3/8in.) square
See Illustration
signed THO
See Illustration
Special notice
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