Maker's Name: 
Where made: 
circa 1950

A simple slide rule with accompanying instructions for use in the case of nuclear war.

The manual begins

'In any atomic weapon explosion, radioactive dust is produced, that initially is highly radioactive, but loses its activity over time. In particular, after ground strikes, it falls  as radioactive fallout, or possibly also as radioactive rain in the area........'


'Dr Buehl's radiation protection calculator serves to provide, on the basis of measurements with a Dosimeter, or on the grounds of wireless or telephone announcements, rapid and as reliable as possible information on the level of danger, also for later periods.'