Science for beginners . pening is provided to allow an equal amount ofair to escape. The ordinary house is often too well built topermit this amount of air to escape through cracks andcrevices. The exit may be provided by partly opening awindow; it is better, however, to provide fireplaces with fluesextending above the roof. Many people do not yet appre-ciate the great importance of proper ventilation for theirhomes and therefore they provide for taking the cold airsupply only from within the house. This practice is a savingof fuel, for none of the air within the house is very cold at 112 THE
Science for beginners . pening is provided to allow an equal amount ofair to escape. The ordinary house is often too well built topermit this amount of air to escape through cracks andcrevices. The exit may be provided by partly opening awindow; it is better, however, to provide fireplaces with fluesextending above the roof. Many people do not yet appre-ciate the great importance of proper ventilation for theirhomes and therefore they provide for taking the cold airsupply only from within the house. This practice is a savingof fuel, for none of the air within the house is very cold at 112 THE PRODUCTION AND USE OF HEAT any time. A common practice, which can be made to meetthe wishes of all, is so to construct the cold air duct, as it iscalled, that the air may be taken either from within the houseor from the outside as is desired (Fig. 82). 120. Placing the Registers and Risers.—The pipes whichlead up from the furnace open into the rooms by means ofregisters, open frameworks of iron. The pipes leading from. Fig 84.—First floor plan for setting afurnace. the furnace to the second floor or higher are made of tin,are rectangular in shape and usually about S1^ in. by 12 as to be easily placed within a 4-in. wall. These hot airpipes are called risers, or stacks. One general rule should be followed: All heating pipesshould be as short as possible; all risers should be placed ininside walls; and all registers shoidd be placed as far as pos- DEVELOPMENT OF HOUSE HEATING 113 sible in the warmest portion ,of the room. The reason forthis rule is easily seen. Just as the tallest chhnney producesthe best draft because it contains the longest column of heatedair, so the upward current of air through the furnace, throughthe riser which leads from it and into the room above willbe strongest if the air is well heated throughout its entirecourse. By placing the riser in inside walls and the registerin the warmest portion of the room, which is usually also
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectscience, bookyear1921
