13 6 GENERAL MANAGEMENT OF GREENHOUSES. 
Lancaster, tried the experiment of doing entirely without one, by introducing the 
pipes themselves into the fire. The result of his experiments he furnished us with, 
together with a plan, which we here insert. His first experiment was placing the 
lower pipe into the fire, so that the water would pass through the flames; next he 
placed two pipes in the fire so as not to pass over, hut be forced back again ; this he 
found to have a decided advantage over the pipe which conveyed the water straight 
through the fire, as the water was forced in those two pipes backward and forward, 
giving a strong motion something like that of a pump, the water being forced 
forward, and the cold forced to the pipes in the fire. All sediment too, which 
might accumulate in the pipes, is entirely prevented by this strong motion. There 
is a regular stroke of six inches with a regular fire, but if the heat is increased the 
stroke will increase two or three inches. 
The house in which the experiment was tried is 24 feet long, 14 feet wide, and 
12 feet high at the back. There are two fire places, one at each end, as in the 
figure. A, B. The fire place at A is in perspective to show it more clearly. That 
at B is only a section ; both fire places are of the same size. 1, is a sliding door 
at which the fire is supplied with coals ; 2, an inclined plane, two feet six inches 
long, and fifteen inches broad, made of cast iron ; 3, is the grate, fifteen inches by 
twelve ; the ashes fall through at 4, as fast as they are made, all the coals sliding 
down the grate as they burn : the greater part of the smoke also is converted into 
heat, being compelled to pass over the flames of the fire on the grate, in its road to 
the flue ; 5, is a single pipe, three inches diameter inside, which passes under the 
bark pit ; 6, a small return pipe, about an inch in diameter, inside measure ; 7, the 
connector which acts for all the pipes, as never more than one fire is in use at one 
time. The two pipes, 8, are twenty-one inches long, and one and a half inches 
diameter inside ; the two pipes, 10, are eight feet long, and three inches diameter 
inside; the pipes, 11, are two feet long, and one inch diameter inside ; the two 
