Weston's Direct Reading Voltmeter An early example of a dual range moving coil DC voltmeter covering 0-15 volts and 0-150 volts. The meter is brought into circuit via a push button. The meter is working but one of the resistance coils is open circuit. This was a post office item, the brass case is stamped GPO. date unknown.
This is one of many instruments collected by Jack Davidson C Eng FIEE which I have been given by Dr Graham Winbolt
Interior of the instrument
Back of the instrument
Edward Weston [1850-1936] founded the Weston Electrical Instrument Company and held 334 patents.