Everett Edgecumbe recording voltmeter
Type DSR

Serial No. 289083

Everett Edgecumbe recording voltmeter voltmeter in wooden case, 180-280 Volts AC. Working.   After cleaning the instrument inside and out, soaking the pen tip in alcohol and putting ink in the reservoir I was able to obtain a trace. The input terminals were connected to a 'Variac' and the reading on the recorder was found to be accurate.  The date stamped on clockwork mechanism is 28/10/1940. Everett Edgecumbe & Co Ltd. Colindale Works,Hendon, London NW9 UK

This is one of many instruments collected by Jack Davidson C Eng FIEE which I have been given by Dr Graham Winbolt.

The markings on this chart do not correspond with those on the metal scale.

Closeup view of the mechanism

Side view showing clockwork winder and gears