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This is the place where the majority of the warbird (aircraft that have survived military service) discussions will take place. Specialized forums may be added in the new future
The only quick reference I could find, was from the Imperial War Museum, but I could not find more specific information regarding the type of aircraft that used it.
I think it was mostly used on patrol bombers that had radar operators. It was used in conjunction with the IFF and radar to give more accurate position information of IFF equipped aircraft and ships/subs.
We have one in the Harpoon but are looking for the amplifier and adapter to go with it. So if you see any black boxes or other components with APA-1 on the tag please keep us in mind.
Here is a link to a page of before and after shots of our Harpoon project. Scroll down a bit to see the scope at the radar operators station