new method of Heating by Hot Water. 249 



e, the grate at the bottom of the furnace, beneath which an ash 

 pit should be formed : /, the flue or smoke-pipe : g, the aper- 

 ture for introducing the fuel : /i, i, cast-iron pipes of three inches 

 diameter, for the circulation of the hot water ; and j, an open 



1 



reservoir, through which the tubes and boiler are kept constantly 

 supplied with water. Those who are not acquainted with the 

 level system of warming by heated fluids, will, by looking at the 

 figure, readily perceive that, upon filling the furnace c, c?, with 

 a proper quantity of fuel, the water in the boiler, becoming heated, 

 rises and flows ofl" through the pipe /i, to the reservoir j, whence, 

 becoming cooler, it returns immediately through the pipe t, to 

 the bottom of the boiler ; and so long as the supply of water and 

 fuel is kept up, the circulation is unceasing. The great improve- 

 ment in the present apparatus consists in placing the furnace in 

 the midst of the body of water, which completely surrounds it. 

 The rapidity with which the water is heated, and the economy 

 of fuel, are the two very important points gained. To these 

 may also be added the small space occupied by the whole fix- 

 tures, and the convenience of its introduction, in desirable cases, 

 in concealed situations, within the hot-house itself, as it is by no 

 means necessary to construct a separate apartment for the furnace 

 and boiler, as they may be placed wherever an ordinaiy cask 

 would have room to stand. 



We could wish no better proof of the thorough competency of 

 this application for warming the air of hot-houses to any desira- 

 ble temperature, than that which we witnessed at Mr. Hogg's 

 garden. An apparatus of moderate dimensions was put up last 

 autumn in a hastily and slightly constructed wooden house, fifty or 

 sixty feet in length, which, with its joints open to every wind, and 

 without any external covering upon the glass, was kept at a tem- 

 perature of 50° with the greatest facility, during the coldest 

 weather, the thermometer ranging meanwhile from 8 to 10° below 

 zero, Fahrenheit. We believe Mr. Hogg, junior, is about pa- 

 tenting his excellent invention, and we cannot refrain from ex- 

 pressing our conviction, that it will (jointly with other systems 

 of heating by hot water) , in a great measure, if not entirely, su- 

 persede the common brick flues, so drying to the atmosphere of 

 plant-houses, and so deleterious in the escaping smoke to the 

 plants themselves. 



VOL. II. NO. VII. 32 



