Case for Wetli planimeter, date about 1860

Wetli planimeter, date about 1860; engraved "Patent Von Wetli & Starke No. 103".

Parts of Wetli planimeter including: Brass cylindrical form with smaller cylindrical stud in the centre on one side; Wooden cylindrical spool with a thin grey wire wound around. There is a hole that runs through the spool in the centre; Flat head screwdriver with brown wooden handle and tarnished brass rim. There is a red/rust coloured mark on the handle. The screwdriver head is in a silver metal colour; Brass circular disk with number 48.96 and two dark circles etched around the circumference. Three small black dots on the underside are identifiable by a silver metal circle mark in a triangular shape on the top side of the disk; Small brush with animal(?) hair fibres and a whitish, translucent handle, possibly made of horn or ivory. Handle also has traces of red lacquer spotted about; and thin and long silver rod either made from metal or graphite.