Cambridge Instruments Constant Inductance Rheostat Two terminal variable resistance scaled 0.015 to 0.12. The substantial thickness of paint on the front panel had lifted due to corrosion. As can be seen I have covered the affected area with black matt paint. Working. Cambridge Instrument Company Ltd, 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
How much is it worth? Instruments such as this are of little use today and not many people seem interested in them. Expect to pay £5-£10
Interior of the instrument