. Scientific news for general readers; a popular illustrated weekly journal of science . causes an unequal pressure in the ascenc-ing and descending pipes, and a continuous circulation isestablished. The Perkins small tubes occupy little space, and are notunsightly; moreover, it is comparatively easy to carry them a complicated system of piping, because thepipes are made of wrought-iron and arc of small these reasons they are much used for the healing ofrooms in dwelling and business houses, especially whenseveral floors have to be provided for. An illustration ofthis is
. Scientific news for general readers; a popular illustrated weekly journal of science . causes an unequal pressure in the ascenc-ing and descending pipes, and a continuous circulation isestablished. The Perkins small tubes occupy little space, and are notunsightly; moreover, it is comparatively easy to carry them a complicated system of piping, because thepipes are made of wrought-iron and arc of small these reasons they are much used for the healing ofrooms in dwelling and business houses, especially whenseveral floors have to be provided for. An illustration ofthis is given in Fig. ^o, in which A is the furnace;B, a room heated by a coil of pipe; C, C, roomsheated by pipes placed behind the skirting, and coveredwith cast iron gratings; D a staircase heated by acoil of pipe ; E,E, rooms heated by pipes fixed to the wallsor skirting, and covered or not with gratings as desired ; Fexpansion tube; G filling pipe; II cold water cistern; Kcistern heated by a coil of pipe ; M bath supplied with hotwater from K. With large pipes the difficulty and expense. (0006) p o o o (0000; LOGO Fig. 24. of carrying out such a system would be excessive, but forchurches, glass-houses, and buildings in which the rooms tobe heated are on one or two floors, the larger pipes andlarger volume of water are preferable. On the other hand,when the quantity of water in the pipe is small, it can soonbe heated, but for the same reason its temperature will soonfall should the fire be neglected. Apart from these considerations, the chief difference in thetwo systems is that the one has a large heating surface withwater at a comparatively low temperature, and the othera small heating surface with water at a relatively hightemperature. Speaking generally, the latter is more effi-cient than the former, because the greater the differencein temperature between the pipes and the rooms to beheated, the more rapid is the transference of heat. Onprinciple, therefore, the Perkins system
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Keywords: ., bookcentury1800, bookdecade188, bookpublisherlondon, bookyear1887
