Steam and Hot Water foe Greenhouse Heating. 167 



sides and high roof. F is a laboratory-house sixteen by sixty feet, 

 about nine feet high, at the gable, having an even span with a roof 

 slope of about thirty-eight and a half degrees, (i. is a continua- 

 tion of the same stinicture, but has a lean-to hip roof. It is 

 sixteen by twenty-four feet. It is without benches, separated from 

 F by a glass partition, and is now covered with cloth, being used 

 as a cool propagating house. 



The boilers are located near each other in the cellar, under the 

 room marked Laboratory, in the plan. The steam heater is a No. 

 6 Furman, made by the Herendeen Manufacturing Company of 

 Geneva, N. Y., a low pressure boiler which, according to the 

 manufacturers' estimate, contains 175 square feet of heating sur- 

 face. The hot-water heater is one made by the Lansinj]: Engine 

 and Iron Works and contain 175 square feet of heating surface. 

 The water is forced through the pipes by the pressure of an 

 expansion tank standing fourteen feet above the heater. The 

 steam boiler heats the north and middle series (A B, C D), and the 

 mushroom pit. Pipes also run into the photograph laboratory and 

 to a smaU radiator in a living room over the laboratory. Two two- 

 inch overhead risers carry the steam from the heater, one riser 

 supplying the series A B, and the other the series C D. The 

 return from each riser is carried by seven one and one-half -inch 

 pipes, there being two under each side bench and three under the 

 center bench. Fig. 2 shows the method of pipin.g. The riser will 

 be seen near the peak and the seven returns under the benches. 

 The hot-water plant heats the house E, containing some 350 

 square feet, the lower house F, and the cloth house G. A coU also 

 runs into the workroom at the rear, but practically very little 

 heat gets into this. Four two-inch risers carry the hot water, two 

 overhead risers supplying the long house F, one the house E, and one 

 the cloth house G. Observations on the hot-water plant were taken 

 only in one run in the long house F. The returns in this case 

 comprise a vertical coil of six one and one-quarter-inch pipes con- 

 nected at the extremities by manifold tees, and passing under the 

 bench. At the boiler end this coU is condensed into two one and 

 one-quarter-in,ch pipes, one taken from the top of the manifold 

 tee and one from the bottom. It is interesting to know that the 



