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 wirewoundresistors 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