. A new thermo-electric fluid-meter and hot-wire anemometer. , showing all electrical connections, heater which is ?- grid of resistance .vire, isplaced hetween tv/o nickel resistance thermometers,as shown in figtire 7, The resistance thermometercoils are kept at temrieratures T^ and Tg, such thatTg-T]^ is fairly constant and about one or two degreesCentigrade, the latter h^irf; the most generally used,A resistance Ri may then be inserted as indicated,in order ?;- comr)ensate for the increased resistanceof rg when heated, and has a value such that, whenTg-Tl is the correct amount, say
. A new thermo-electric fluid-meter and hot-wire anemometer. , showing all electrical connections, heater which is ?- grid of resistance .vire, isplaced hetween tv/o nickel resistance thermometers,as shown in figtire 7, The resistance thermometercoils are kept at temrieratures T^ and Tg, such thatTg-T]^ is fairly constant and about one or two degreesCentigrade, the latter h^irf; the most generally used,A resistance Ri may then be inserted as indicated,in order ?;- comr)ensate for the increased resistanceof rg when heated, and has a value such that, whenTg-Tl is the correct amount, say 2° C,, the needle ofthe galvanometer ?;ill be in its c;entral position. Nowsuppose that there is equilibrium nnd the ener;-^^ im-parted to the gas is just sufficient to heat it fromT^^ to Tg, but that then the quantity of gas or airflowing is suddenly reduced. With the same energy im-parted to the heater, the temperature Tg will rise invalue, and the galvanometer needle will be deflected. Pl/it£ \/1a^:mo/^£7-s/^ P/iG£ <JE. S£Y/^£RLiCH- ikN. ^ f/>i£0 CoAfT/lCT. ** a A/e££>L£ 0/= (7^£y/H^OM£r£R I 6 Co/vr/9crs oA//?or/fr//^€ 0^<//^. /^/6iy^£^ «
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Keywords: ., bookcentury1900, bookdecade1920, bookidnewthermoele, bookyear1920
