EXPERIMENT STATION BULLETINS. 



195 



(Fig. 17. — Section of Drop Tube, Furnian Heater.) 



The steam heater was provided with a diaphragm automatic draft 

 Teg-nlator (Fig. 15), and in order that the hot water heater might be under 

 ■equal control, Prof. K. C. Carpenter designed an automatic draft and 

 damper regulator. This has worked in a very satisfactory manner and no 

 doubt should be credited with much of the uniformity of temperature 

 secured in the hot water house. 



The smoke pipes were eight inches in diameter and each entered a flue 

 of its own measuring 8x12 inches inside. 



THE PIPING. 



In arranging the pipes it was particularly desirable that the systems 

 used should be as nearly perfect as possible, in order that each method of 

 heating might have a fair showing. They were arranged as follows: 



First, In the steam house, two 1^ inch pipes are carried to a point two 

 feet below the ridge, and then gradually fall to the other end, where they 

 divide, each supplying three l| inch returns; one of the returns is beneath 

 the center bench, and the others are fastened to the legs of the side benches, 

 (See Figs. 4, 5 and 19). The flow pipes are supported by brackets 

 •clamped upon the center posts; they are provided with globe valves and 

 with Jenkins automatic air valves. There is in this house 400 linear feet 

 of 1| inch pipe with a radiating surface of 200 feet. This gives one foot of 

 radiating surface to 31 cubic feet of space, and one to 5| square feet of 

 glass. 



Second, The hot-water house has two flow pipes of the same size and 

 similar in arrangement to those in the steam house, each of which supplies 

 a 1| inch return pipe located beneath the center bench. 



In addition, there are two 2 inch flow pipes each of which supplies two 

 1^ inch returns. These are all located on the legs of the side benches. 

 In both houses the pipes rise to their highest point as soon as they leave 

 the heater, and descend uniformly from that point. 



The hot water house contains 400 linear feet of 1^ inch pipe and 100 

 feet of 2 inch, with 275 sq. feet of radiating surface, being one to 25| cubic 

 feet of space, or to 4 square feet of glass. 



The hot water system is connected with the college water works, and if 

 desired these can be utilized to increase the pressure. Thus far, however, 



