Free convection of heat in gases and liquids — II

V. M. Montsingera About ten years ago or something over, Dr. Langmuir published his first paper on the film theory, in which he showed the remarkable agreement between the test results and calculations, at high temperatures, principally from 100 up to 1000 degrees. I could never get satisfactory results at temperatures below 100 degrees, which is a very important field for electric apparatus, especially transformers, generators and motors, and in fact, Dr. Langmuir himself agreed with me that the film theory did not check exactly at these low temperatures, and there was some factor that was not exactly known. Now, fortunately, Mr. Rice has shown us the method to use and has introduced a factor that takes care of the discrepancies.