The paper deals with the calculation of short-time ratings, particularly with respect to those specified in B.S. 587—1940, Clause 58. Briefly these are: 5 min “on” in every 15 min, and 2 min “on” in every 15 min. The method is based on the exact laws of heat radiation and convection, and gives results very closely substantiated by test.
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L.H.R. Everitt (1945) studied this question.