Cooke, Josiah Parsons, 1827-1894 · Boston, Little, Brown and Company · leaf 645
soon asthe tension of the steam exceeds a limited amount. The area ofthe valve is adjusted to the extent of the heating surface of the 620 CHEMICAL PHYSICS. boiler, and to the maximum tension at which the boiler can beworked with safety. It is determined by means of the empiricalformula. d 2G sfw-… … formtila will allow all the steam to escape which can be generatedby the most active fire ; but, for greater security, a boiler is gen-erally provided with two valves of these dimensions. We can also limit the tension of the steam by fixing a limit toits temperature. Tliis can be done by closing a…
Matter · Heat
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