Weston model 341 voltmeter 0-150 Volts full scale deflection AC/DC electrodynamometer type instrument. The meter is brought into circuit via a push button [lower left]. The meter is now working after the removal and replacement of the internal resistors by a combination of more modern wire wound types. The faulty resistors are shown below. As a result of poor storage mould had grown on the varnish used to keep the fine resistance wires in place and caused them to go open circuit. The calibration table and instruction card has been removed from the lid. The original leather handle and latch have been replaced by ones of lesser quality. Date unknown but possibly 1935-45. Weston Electrical Instrument Company, Newark New Jersey USA.
This is one of many instruments collected by Jack Davidson C Eng FIEE which I have been given by Dr Graham Winbolt
Three of the faulty resistors removed from this instrument.
Edward Weston [1850-1936] founded the Weston Electrical Instrument Company and held 334 patents.