. Carnegie Institution of Washington publication. ished, the experiment proper began. An automatic counterrecorded the number of revolutions of the shaft outside the chamber; atthe exact moment of beginning the period, a reading of this counter wastaken, the current of water to bring away the heat was deflected into alarge can on a platform balance, so that the amount of water passingthrough the heat-absorbing coils could be accurately weighed, and theinitial temperature of the air inside the calorimeter was carefully recorded,all of these records being continued for several successive series
. Carnegie Institution of Washington publication. ished, the experiment proper began. An automatic counterrecorded the number of revolutions of the shaft outside the chamber; atthe exact moment of beginning the period, a reading of this counter wastaken, the current of water to bring away the heat was deflected into alarge can on a platform balance, so that the amount of water passingthrough the heat-absorbing coils could be accurately weighed, and theinitial temperature of the air inside the calorimeter was carefully recorded,all of these records being continued for several successive series of 1-hourperiods. Every 4 minutes the temperatures of water entering and leavingthe chamber were recorded, and the temperature of the zinc wall was ad-justed whenever necessary to bring it to the temperature of the copperwall, so as to maintain adiabatic conditions throughout the whole ex-periment. Usually each calibration test occupied five or six 1-hour pe-riods. At the end of the experiment the calorimeter door was opened CALIBRATION TESTS 13. Fia. 3.—Scheme for calibration of the ergometer in a respiration calorimeter. The ergometer, divestedof handle-bar3 and seat, is placed in a vertical position inside a respiration chamber. The copper diskD rotating between the pole-faces P of the electro-magnet C generates heat which is measuredby the calorimeter. The electric motor and reduction pulleys are used to rotate the ergometer atdifferent speeds for purposes of calibration. 14 A BICYCLE ERGOMETER WITH AN ELECTRIC BRAKE quickly and the temperature of the copper disk recorded by placing amercurial thermometer upon it, a rapid conduction of the heat being se-cured by covering the bulb of the thermometer first with a closely fittingpiece of sheet lead and then with a large piece of cotton batting. As soonas the mercurial thermometer reached its maximum point the temperaturewas recorded. While possibly this method did not give the exact tem-perature of the inner part of the copp
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