. Official proceedings . -) is about I^c per 10 degrees, netresults are very much less when the additional heat to be im-parted to the steam and the extra cost of investment is borne inmind. To illustrate, Fig. 7 has been prepared to show the net re-sults to be expected. It is quite evident the range of maximumeconomic gain lies between 50 and ioo° F. superheat. Thehigher superheat contributes toward lower steam consumptionat the prime mover, but the over all plant results, which is theultimate criterion of economic operation, is not bettered muchbeyond 100° F. Furthermore, it is to be admitte
. Official proceedings . -) is about I^c per 10 degrees, netresults are very much less when the additional heat to be im-parted to the steam and the extra cost of investment is borne inmind. To illustrate, Fig. 7 has been prepared to show the net re-sults to be expected. It is quite evident the range of maximumeconomic gain lies between 50 and ioo° F. superheat. Thehigher superheat contributes toward lower steam consumptionat the prime mover, but the over all plant results, which is theultimate criterion of economic operation, is not bettered muchbeyond 100° F. Furthermore, it is to be admitted that the highersuperheat entails more expensive fittings and appurtenances, andis subject to greater repair expense. Selection of the most efficient vacuum can be similarh in- 33(^ Proceedings Railway Club of O ^ Oil O -o [^ Present Steam Turbine Progress. ^2,7 vestigated. No difficulty is experienced in maintaining 28 inchesof vacuum, or slightly above, throughout the year, with efficientcondensers of types recently developed, with average water tem-peratures obtaining at latitudes through the Pittsburg section andabove. Ordinarily considered, approximately 28 inches is thenormal vacuum to be maintained. Turbines are so greatly beue-fited by the high vacua that they have wrought a revolution incondenser practice. Referring to the water ratio chart (Fig. 8),
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