. A new thermo-electric fluid-meter and hot-wire anemometer. heating filament. As in the consideration of other types ofanemometers, it is necessary to calibrate thethermocouple-type under the conditions that it isto be used. If the instrument is to be used in measuringair velocities at ordinary temperatures, it may becalibrated in a manner similar to that describedby King and Kennelly. In other words, calibrationcurves may be obtained by placing the anemometeron a revolving arm, the speed of which may be variedat will. From the results of such a calibration, acurve may be plotted showing the
. A new thermo-electric fluid-meter and hot-wire anemometer. heating filament. As in the consideration of other types ofanemometers, it is necessary to calibrate thethermocouple-type under the conditions that it isto be used. If the instrument is to be used in measuringair velocities at ordinary temperatures, it may becalibrated in a manner similar to that describedby King and Kennelly. In other words, calibrationcurves may be obtained by placing the anemometeron a revolving arm, the speed of which may be variedat will. From the results of such a calibration, acurve may be plotted showing the relation betweenthe speed of the wire through air at room temper-ature of about 21° C, and the current required tomaintain the thermocouple hot-Junction at a temper-ature of 200° C, as shown in curve No. 12, Theabscissas represent the values of velocity in feetper minute, while the ordinates represent thecorresponding values of current in amperes, requiredby the heating-wire to maintain the hot junction at200° C. The data for this particular cxirve was.
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Keywords: ., bookcentury1900, bookdecade1920, bookidnewthermoele, bookyear1920
