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 Mills' test of indirect radiators.—For these reasons, all rules thus far deduced for installing indirect radiators are entirely empirical. But very few tests have been made upon indirect radiators with a view to establishing the relation between any of the variables involved; but some valuable results might be obtained by a thorough series of experiments carefully and systematically carried out. Mr. J. H. Mills, in his work on Heat, published in 1883, presents the collected results of a number of tests on several indirect radiators of different types. These tests were made on various radiators at various times and by several different experimenters.

The writer has taken from the Mills table the results given for the two radiators upon which the greater number of tests were made and has endeavored by plotting some diagrams from them to determine something of the relationships between the existing variables. The results published by Mr. Mills on the Gold pin radiator and the Whittier radiator are presented in the