Sclerometers

Modernized scratch sclerometer with rolling weight system. Height 37 cm; tripod table: 24.5 x 8.5 cm.
The present instrument misses a goniometer-type adjusting device, a pan connected by a cord with the goniometer table and an adjustable counterpoise.
Signed on the circular table "R. Fuess | Steglitz – Berlin", ca 1930.