. A new thermo-electric fluid-meter and hot-wire anemometer. tybalance at the lowest possible value of heating-current which may be accurately measured, The valueof this zero velocity current, therefore, dependsto a great extent upon the sensitivity of the currentmeasuring instrument employed. A value which has beenfound convenient by the author in one type of instru-ment was 50 milliamperes or ,05 of an ampere. In the type of iJluid-Meter developed by theauthor and shown in figure D, two heating elementsare placed in parallel, each of v^fcich has attached atits mid-point a wire of different m
. A new thermo-electric fluid-meter and hot-wire anemometer. tybalance at the lowest possible value of heating-current which may be accurately measured, The valueof this zero velocity current, therefore, dependsto a great extent upon the sensitivity of the currentmeasuring instrument employed. A value which has beenfound convenient by the author in one type of instru-ment was 50 milliamperes or ,05 of an ampere. In the type of iJluid-Meter developed by theauthor and shown in figure D, two heating elementsare placed in parallel, each of v^fcich has attached atits mid-point a wire of different material so that twosimilar thermocouples are placed in series. One heat-ing element is of No. 26 B. & S. Gauge Advance v/hilethe other is of Manganin or Therlo of the same the center of the Advance wire there is welded aManganin or Therlo wire, while at the mid-point of theManganin or Therlo heating wire there is v/elded anAdvance wire. The principle of operation is as follov/s:Since Advance and Manganin have practically the same /^/trs/^^..
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Keywords: ., bookcentury1900, bookdecade1920, bookidnewthermoele, bookyear1920
