Everett Edgecumbe Watt meter Dynamometer instrument 0 to 100 Watts 260/130 [switch selectable] Volts 1 Amp AC/DC. Working, Everett Edgecumbe & Co Ltd. Colindale Works,Hendon, London NW9 UK, 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
The brass terminals are not original and seem rather hazardous! The wire wound resistors in series with the voltage coil are at the top of the instrument. A lever on the left hand side can be used to clamp the pointer at zero when the meter is not being used.