Heating Horticultural Buildings. 



101 



without the water being drawn from the tank, my employer 

 pronounced not worth eating. The plan of a melon pit 

 which I would recommend for those who do not study a lit- 

 tle extra expense in erection, and who want an efficient ar- 

 rangement for any, and for all, seasons, would be, a pit 8 feet 

 wide, with a tank and pipes similar to those shown in the 

 following plans, {^Jigs. 6 and 7.) From the flow-pipe, after 



Fig. 6. Ground plan of an improved Melon Pit. 



a Walls of the tank. 

 b Pipes for hot water. 



c Pipe for conducting the hot water through the pit, shown in the section ( fis. 7) 

 near the front wall. 

 Scale of Jigs. 6, 7, 8, and 9, 1-8 of an inch to the foot. 



it has gone its greatest distance in the tank, let a branch, {c) 

 for surface heat, be taken up and along near the glass in front. 



It will require to have a stop-cock 

 near where it branches off the flow, 

 and one upon the return-pipe in the 

 tank, near the same place. The 

 cross upon the pipes, in the plan, 

 if'g'- ^y) show v/here I mean. By 

 this arrangement, a sufficiently dry 

 atmosphere may, at any time, be 



Fig. 7. Section of an improved Melon Pit. 

 a Tank. 



b Earth for the plants. 



c Trellis for training the vines. The pipe in front is for warming the air and dis- 

 pelling damp, communicating with the pipes a. 



obtained, and the surface pipe need not be used except when 

 wanted. The ground plan and section will best explain it. 



