. Journal . rable deflection, in other words, the steam consumedby the 30 enffine alone cannot be measured. There-fore, in cases where the steam consumption varies con-siderably, these difference-meters cannot be used if ahigh standard of exactness is required., The Farbenfabriken vorm. Friedr. Bayer & Co. useda number of these difference-meters for a long time,until they succeeded in 1902 in devising an instrumentconsiderably superior in every i-espect to the difference-meter above mentioned. This meter determines thesectional area of the current of steam ; hence it appliesa principle q
. Journal . rable deflection, in other words, the steam consumedby the 30 enffine alone cannot be measured. There-fore, in cases where the steam consumption varies con-siderably, these difference-meters cannot be used if ahigh standard of exactness is required., The Farbenfabriken vorm. Friedr. Bayer & Co. useda number of these difference-meters for a long time,until they succeeded in 1902 in devising an instrumentconsiderably superior in every i-espect to the difference-meter above mentioned. This meter determines thesectional area of the current of steam ; hence it appliesa principle quite different from that of the difterential-meter. The new steam-meter is based on the followingsimple formula which applies to gases and liquids :— W=S. y V. In this formula, W is the total steam passing throughthe meter, expressed in kg. per. sec, S the sectionalarea in sq. meters. V the velocity of steam in metersper. sec, and -/ the weight of 1 cbm. of steam of theaverage pressure expressed in 1 L Lender all conditions of gases passing through a pipe,Swill, as a rule, remain invariable, while y and V will 634 KUHNKE—A NEW STEAJI-METER. [June 30, IftOt. vary. However, it is possible, by making S variable,to make V, which can only be measured with difficulty,constant for each y. This possibility, of kcepineV constant in a gas current by varying the sectionalarea has been effected in a simple manner. In a casinga hollow truncated cone is and within it a discwhich can nitive freely up and down is suspended by awire. The wire is Icil through the bonnet of the casingover a pulley and balanced by a counter weight. Thesteam entering the box must pass through the truncatedcone in order to flow to the place of consumption: con-sequently the disc is forced downwards and stops in aposition the sectional area of which is determined bythe actual consumption of steam. That is to say, thedisc balanced by the weight keeps such a position thatthe difference of the pres
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectchemist, bookyear1882
