AC Range box for versatile galvanometer Designed to be used in conjunction with a 500 ohm Unipivot meter. The unit has a multi tap current transformer, a set of wirewound resistors and a meter rectifier. 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
Interior of the instrument
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