ABSTRACT
The first of the radiation slide rules was designed by the German experiential physicist Marianus Czerny and was of the linear type. Compared to the radiation slide rules that were to come, Czerny's rule was a relatively simple affair. Later radiation slide rules that appeared in England and the US always used the total radiant exitance rather than the total radiance. Makowski's design for the Admiralty rule was one of the most elaborate of all the radiation slide rules to be made. Of all the radiation slide rules produced, the DENEM Nuclear Radiation Calculator is the most elusive. By the late 1950s Arthur John Cussen already had a close connection with radiation slide rules. The field of thermal radiation readily lends itself to a special purpose slide rule. Calculations in this field are particularly tedious due to the cumbersome mathematical form the laws of thermal radiation take on.
