細節
A late 19th-Century planimeter,
signed on the arm Crosby Steam Gage & Valve Co., Boston, U.S.A. & London, Eng., in plush-lined fitted case -- 11½in. (29.2c,m.) wide; and an unusual chart scale rule by NEUHÖFER & SOHN, WIEN, the centre grid formed with fine hair or gut stringing, in fitted pine case with maker's trade label -- 13¾in. (35cm.) wide
See Illustration (trade label)
signed on the arm Crosby Steam Gage & Valve Co., Boston, U.S.A. & London, Eng., in plush-lined fitted case -- 11½in. (29.2c,m.) wide; and an unusual chart scale rule by NEUHÖFER & SOHN, WIEN, the centre grid formed with fine hair or gut stringing, in fitted pine case with maker's trade label -- 13¾in. (35cm.) wide
See Illustration (trade label)