THE TANK MODE OF HEATING. 



201 



the time. By lighting the fire about five 

 or six o'clock in the evening, he finds he 

 can keep the water in his tanks at from 

 112° to 116° — a heat quite sufficient for 

 all useful purposes. It is a pity that Mr 

 Huyshe has not stated with equal precision 

 the season of the year at which he made 

 the above experiments. 



The Honourable Robert Clive's improved 

 mode of tank-heating, fig. 259. — This we 

 consider an excellent mode of heating 

 with tanks or gutters, and smoke-flue 

 combined. The principal feature, how- 

 ever, in this plan, is the supply and cir- 

 culation of air made to pass over the 

 tanks, and afterwards diffused through the 

 house. The following sketch and de- 

 scription will illustrate its principle : — 

 " a is an air-pipe, whose orifice is at the 

 ground-level, and which passes under 

 ground into a hot-air chamber, which it 

 enters at d. A plug at a being removed, 

 cold air rushes down into the chamber, 

 passes through a pigeon-holed wall at /, 

 rises through a cavity at e, whence, loaded 

 with vapour, it is admitted into the house 

 when occasion requires : c c are two zinc 

 open troughs, 12 inches by 3, filled with 

 water, communicating with a saddle- 

 backed boiler, and passing along the 

 house into a chamber covered with wood, 



Fig. 259. 



260, 261, with description, of what we 

 think a very excellent pit. The walls 



Fig. 260. 



on which the pine-beds rest; b is the 

 smoke flue." Remove the wooden cover- 

 ing, and substitute for it Bangor slate or 

 thin pavement, and cast-iron for zinc 

 troughs, and this pit will be complete. 



Mitchell, of the Union Road Nursery, Ply- 

 mouth, has published in " The Gardeners' 

 Chronicle " the annexed section, figs. 



VOL. I. 



Fig. 261. 



are built hollow, and with bricks on edge. 

 Fig. 260 is the section ; a walls of the 

 pit; b tank; c cross walls by which the top 

 or roof of the tank is supported; d bed of 

 earth for plants ; e drainage ; / trellis to 

 which the shoots of " cucumbers or 

 melons " are trained ; g pipes for heating 

 the atmosphere. Fig. 261 represents 

 the internal section : "a interior of the 

 tank ; b partitions with apertures in their 

 upper edges for the circulation of heat ; 

 c cross walls, by which the tank is sup- 

 ported ; d sides of the bed." 



" The tank, in the accompanying sketch, 

 is supported on cross walls, which are 3 

 feet apart, and a vacancy of 2 inches is 

 left between the sides of the tank and the 

 walls of the pit, for the purpose of readily 

 transmitting the heat given out by the 

 sides and bottom to the atmosphere. 

 The interior of the tank is 6 inches deep ; 

 it is divided longitudinally by three par- 

 titions ; — the middle one runs the whole 

 length of the tank, dividing it into two 

 separate compartments, each having its 

 flow and return. In the upper edges of 



2 c 



