This is a cold war Radiation slide rule for Nuclear Fission products from the Admiralty research Laboratory. Made by and marked by the English Company Blundell signed BRL (Blundell) on rule. The case is a later print for the Dutch military reading Radiation slide rule in Dutch. It has 2 sliders with black and red scales for LAND and a side for SEA with green and black scales . Instructions are on the back as well as on paper (general English description of this slide rule type). It is an unusual heavy all plastic construction with large metal and plastic cursor. Everything is in great shape with small signs of age only. Container is in reasonable condition with some writing in black and some tape on one end (but complete). The slide rule measures 30 cm or 12 inches wide. Check the attached video on how to work your vintage man tool : slide rule operation instructions!
