. Journal of electricity, power, and gas . Itmay also be used to determine the deterioration of efficiencyof a boiler due to the formation of scale, besides being a 552 JOURNAL OF ELECTRICITY, POWER AND GAS [Vol. XXIV-No. 24 means of determining the efficiency in tlie method of stoliing. The meter consists of two cylindrical hollow cups filledto about half their hight with mercury. The cups are joinedtogether at the bottom, forming a XJ-tube which is supportedon and free to move as a balance about a set of knife edges. A difference in pressure in the nozzle plug is communi-cated to the cups by
. Journal of electricity, power, and gas . Itmay also be used to determine the deterioration of efficiencyof a boiler due to the formation of scale, besides being a 552 JOURNAL OF ELECTRICITY, POWER AND GAS [Vol. XXIV-No. 24 means of determining the efficiency in tlie method of stoliing. The meter consists of two cylindrical hollow cups filledto about half their hight with mercury. The cups are joinedtogether at the bottom, forming a XJ-tube which is supportedon and free to move as a balance about a set of knife edges. A difference in pressure in the nozzle plug is communi-cated to the cups by flexible steel tubing placed within thecase. This difference of pressure causes the mercury to risein the right-hand cup and fall in the left-hand cup until theunbalanced column of mercury exactly balances the differ-ence in pressure. By this displacement of the mercury, the beam carryingthe cup moves downward on the left-hand side of the knifeedges until the movement of the weights on the right of the To ,Vo2-z/e P/ui^ Ba/anc/ng Wf/gM. Fig. 3. Recording Steam Flow Meter With AutomaticPressure Correction. knite edge exactly balances the moment caused by the displace-ment of the mercury in the right-hand cup. The movementof the beam is multiplied by levers and actuates a pin whichmoves in proportion to the amount of mercury displaced. The recording drum feeding the paper is driven by aneight-day clock. The paper on which the record is made isso calibrated that the rate of flow in poimds per hour maybe read at any instant, or the average rate calculated for agiven time. For compensating for variation in pressure and tempera-ture a hollow spring is provided, similar to the pressure springin a steam gauge, and is connected so as to be influencedby the steam pressure at the point where the flow is beingmeasured. Any variation of the static pressure causes thespring to extend or contract, and this movement actuates asmall correction weight in such a manner as to affect thedeflection
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Keywords: ., bookcentury1800, bookdecade1890, bookidjo, booksubjectelectricity
