Page:Journal of the American Society of Mechanical Engineers, Volume 33.pdf/673



72While the four psychrometric principles might be all logically surmised, experimental demonstration is desirable. A calorimetric method was devised

by the author for this purpose and also to determine the probable error of the indications of the wet bulb in the sling psychromcter due to radiation.

73The apparatus used is shown in Figs. 11, 12 and 13. Air was supplied by fan A at slight pressure to the wooden air duct B, from which it escaped through the oriﬁce C, and through the tube D, in which the wet-bulb