Jppa7'atiis joy heating Hot-Jwiises. 



297 



poses such, for instance, as hot plates for cooking, h {fig. 4-6.) shows the 

 manner of applying the apparatus to a rectangular boiler, which boiler 

 is shown in plan, and is applicable to the boiling of syrup in the making 

 or refining of sugar ; by which it will be seen that the heated water is 

 made to circulate through a series of tubes, and give off its heat to the 

 fluid contained in the boiler ; or these tubes may be made to pass into 

 steam or other boilers in a similar manner, and will cause the fluid con- 

 tained in such boilers to become heated and evaporated. 



" In heating the air of rooms of buildings, the tubes p and c may be 

 made to pass around the flooring of such room, and where a large quantity 

 of heat is desired, it will sometimes be desirable to have more than one pipe 

 passing to and from the coil of pipes contained in the furnace, whereby a 

 larger quantity of heated surface will be presented, which, being heated to 

 a high degree of temperature, will give off the same to the air contained in 

 the room or buildings, and warm the same ; and T have found that when 

 the circulating tubes present a surface equal to three times that of the 

 coil of tubes in the furnace, I have not been able to burst the tubes. 



" Having now described the nature of my invention, and the manner of 

 carrying the same into effect, I would have it understood that I lay no 

 claim to the various parts of which such apparatus is composed ; neither 

 do I claim the application of the circulation of hot water to the purposes 

 above described : but what I claim as my improvements in such apparatus 

 or method of heating the air in buildings, heating and evaporating fluids, 

 and heating metal, consists in circulating water in tubes or pipes, which are 

 closed in all parts, and have sufficient space allowed for the expansion of 

 the water as above described." 



We hope the time may soon arrive, when one of those working men's 

 colleges, which an enlightened, spirited, and most benevolent author, 

 Junius Redivivus, has recommended in the Mechanic^ Magazine, will be 

 erected and peopled, and be supplied with heat, for all the purposes of 

 domestic economy, comfort, and enjoyment, by Mr. Perkins's apparatus. 

 Notwithstanding what has been said against the college of Junius Redi- 

 vivus, and also against our own college {Mech. Mag , vol. xvi. p. 332.), 

 we are convinced that such arrangements, in the present state of society, 

 would contribute uncommonly to the comfort of the working classes in 

 London. — Cond. 



