container for Infra-Red Viewer 5C/3157 (Tabby type F) the RAF stores reference 5C/3157, and would have been used as a visual IFF (Identify Friend or Foe) in bombers and fighters to identify friendly aircraft via a flashing infrared beacon mounted in the tail. It consists of a black painted clear plastic tube which houses the image converter and eyepiece, and a brass tube that contains the objective optics. The device requires a very high voltage (around 3000V) to operate, which would have been produced by a separate power supply connected via the braided EHT lead.
Portovrij? In NL boven € 200,-