"Prismatic Compass Schmalcalder London 1810 - 1826 "
Rare prismatic compass in green cardboard and brass. Signed: Schmalcalder, Patent, 28 Strand, London Charles Augustus Schmalcalder was at 82 Strand in London from 1810 to 1826. Serial number 719 B on the cover and the compass. The compass measures 2.6 cm in height and 7.4 cm in diameter. The condition is good, slight scratches from use.