. Machinery and processes of the industrial arts, and apparatus of the exact sciences. 348 PARIS UNIVERSAL the wall by the straight tube e, which connects and is continuous withthe original spiral A, at the bottom. This tube e is not indicated inFig. 82. Fig. 82. M. de Marval causes this portion of the tube to passthrough the water tank G, forthe purpose of keeping up a con-stant supply of hot water for gen-eral uses. It will be understood that theexpansion of water with increaseof temperature is much greaterthan that of iron, and consequent-ly that if the tube is absolutelyfull o
. Machinery and processes of the industrial arts, and apparatus of the exact sciences. 348 PARIS UNIVERSAL the wall by the straight tube e, which connects and is continuous withthe original spiral A, at the bottom. This tube e is not indicated inFig. 82. Fig. 82. M. de Marval causes this portion of the tube to passthrough the water tank G, forthe purpose of keeping up a con-stant supply of hot water for gen-eral uses. It will be understood that theexpansion of water with increaseof temperature is much greaterthan that of iron, and consequent-ly that if the tube is absolutelyfull of water, the pressure whichit is capable of exerting by itsexpansion as a liquid will be agreat deal greater than that whichwould belong to steam formed atan equal temperature. It is neces-sary to provide against this; andsuch a provision would at firstthought seem to be easilv andMarvals Heating Apparatus-plan. effectually secured by leaving a small portion of the tube to contain air only. But inasmuch as the circu-lation of the liquid is the condition indispensable to the transportation ofthe heat, and as this c
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