A text-book of physics, largely experimentalOn the Harvard college "Descriptive list of elementary physical experiments." . the vessel is too full or the tube dips too short a distance beneaththe surface. 299. Record and Calculation of Results.— Let mc = mass of calorimeter;m = cold water;ma = steam;tw = temperature of cold water;tm = • mixture; x=latent heat of steam. Call t8, the temperature of the steam, 100 the specific heat of the calorimeter that there are two portions of heat yielded to the PHYSICS. cold water, namely, that portion which proceeds from thecondensation o
A text-book of physics, largely experimentalOn the Harvard college "Descriptive list of elementary physical experiments." . the vessel is too full or the tube dips too short a distance beneaththe surface. 299. Record and Calculation of Results.— Let mc = mass of calorimeter;m = cold water;ma = steam;tw = temperature of cold water;tm = • mixture; x=latent heat of steam. Call t8, the temperature of the steam, 100 the specific heat of the calorimeter that there are two portions of heat yielded to the PHYSICS. cold water, namely, that portion which proceeds from thecondensation of the steam; and that which is derived fromthe resulting water, at 100°, cooling to the final tempera-ture. With these directions the student should form an equa-tion between the amount of heat given out on the one handand that taken in on the other, and from this equation findthe value of x, the quantity to be determined. See §§ 281and 287 300. Steam-heating of Buildings.—The great latent heatof steam shown in the preceding Exercise, makes this fluidan effective agent for the heating of buildings. A compara-. FIG 203 tively small flow through the radiating pipes is sufficient, forevery pound of steam that condenses in these pipes yields avery large amount of heat. The main features of a simplesteam-heating system are shown in Figs. 203 and 204. CHANGES OF PHYSICAL STATE. 371 Coal is burned in the fire-box G (see Fig. 203). Theheated air and the hot gases given out by the combustionpass from front to back under the body of the boiler andfrom back to front through tubes, between and abovewhich lie the water, the upper surface of which is at is a damper to control the draft. The steam passing out through the main pipe, or main,M, goes to the radiating tubes P, where it is gradually con-densed by loss of heat to the air. The water thus formedin the tubes drains into the return pipe R, where itaccumulates until its weight, assisted by the steam-pressureupon its upper s
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