Details
A Webb Adder,
of pear-form with brass plate on wood base, main and subsidiary dials perforated for stylus operation, signed C.H.Webb N.Y. "The Adder" Patd. March 10th 1868 -- 6¾in. (17cm.) long
of pear-form with brass plate on wood base, main and subsidiary dials perforated for stylus operation, signed C.H.Webb N.Y. "The Adder" Patd. March 10th 1868 -- 6¾in. (17cm.) long