I like 1940s electrical devices and instruments- they might no longer work, but I find them really interesting and I have built up quite a collection of different examples now. Today we are looking at a small Air Ministry Milliameter, with a black Bakelite housing:

The milliameter has a central dial, with two buttons covering ‘In Circuit’ and ‘Shorted’:

The dial has the crown and AM initials and Crown badge showing Air Ministry ownership, together with a 10A/ stores code and a date of 1940:

The base of the milliameter has a pair of brass contacts that allow a couple of leads to be attached to connect to the electrical circuit being tested: