Identifier: americanaunivers03newy (find matches)
Title: The Americana; a universal reference library, comprising the arts and sciences, literature, history, biography, geography, commerce, etc., of the world
Year: 1908 (1900s)
Authors:
Subjects: Encyclopedias and dictionaries
Publisher: New York : Scientific American Compiling Dept.
Contributing Library: University of California Libraries
Digitizing Sponsor: Internet Archive

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s made in these investigationsare in terms of heat, since other forms ofenergy may be transformed into it. To thisend it is necessary to know how much energy istaken into the body in food and drink, howmuch is given off unused in the solid and liquidexcreta, and how much is transformed in thebody and given off in the forms of heat andexternal muscular work. burned outside the body, that is by their heatsof combustion, as learned by burning samplesof them with oxygen in an apparatus called thebomb calorimeter. As regards the outgo of energy it must beremembered that heat is constantly given offwithin the chamber of the mans body, whetherhe is at work or at rest. When he is at rest,/. c, doing no external muscular work, there isnevertheless a great deal of muscular workgoing on within his body. Even when he isasleep the organs of respiration, circulation anddigestion are active. The energy of the in-ternal work is transformed into heat in thebody and leaves the body as heat. In rest ex-
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FIG. A. GROUND PLAN OF RESPIRATION CALORIMETER LABORATORY. A. Device for regulating temperature of ingoing air cur- rent. B. Tank for compressed air used to drive valves of meter pump and operate brine pump of freezing apparatus. C. Shaft for driving meter pump and other mechanism.F. Feed pump bringing ammonia to freezing apparatus.R. Return pipe conveying ammonia from freezing appar-atus. O. Food aperture. Pi. Pipe bringing air to freezing tank. p2. Pipe conveying air from freezing tank to respirationchamber. D. Freezer used to remove moisture from ingoing air. P3. Pipe conveying air from respiration chamber to freezer.P4. Pipe conveying air from freezer to meter pump.G. Freezer used to remove moisture from outgoing air.Si. Pipe conveying air for analysis from chamber to aspira- tor.S2. Pipe conveying sample of ingoing air for analysis to meter.M. Small meter used to measure samples of ingoing air.H. Secondary shaft connecting main power shaft with meter pump.K. Box where g.alvanomet

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