STEAM-ESGINE TRIALS. CORRESPONDENCE ON NON-CONDENSING [Niuutes of Mr. Bodmer. he would take the data from Table I, under the trial letter and numbers S-(p. lG1). Here there was a mean admission pres-110 4.4 sure of 106.34 lbs. per square inch, a mtio of expansion of 4.57, which might be taken as corresponding, with sufficient accuracy for the purpose of illustration, to a terminal pressure of 21 lbs. absolute. Assuming the steam to be initially dry, and calculating the quantity condensed by the time tho pressure was reduced by expansion to 21 lbs., he found this quantity to amount to about 9 per cent. of the total weight of steam used. The percentage of feed-water missing at the end of the stroke was given as 21-53, but should be, in his opinion, strictly speaking, only 21-5 3-9 = 11-53, as otherwise 9 per cent. of feed-water would, by the Author's method, appear to be missing even with a non-conducting cylinder ; whereas this proportion of condonsation was the inevitable result of the adiabatic expansion of initially dry steam. The formula, as given by Clausius and Rankine for calculating the proportion of steam condensed (or re-evaporated) during adiabatic expansion, was-Y x1 T1 T X-=-+ c hyp low-1, * Minutes of Proceedings Inst. C.E. vol. hxii. p. 275. CORRESPONDENCE ON SON-CONDENSING
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