Transactions . ater accompanying a pound of dry convenient this may be for heating and ventilating workand other engineering problems, there are several reasons for prefer-ring the use of a value expressed in grains of water in a cubic foot ofmixed air and water vapor, in connection with combustion phenomenaand the effects of moisture on blast-furnace operation. Previouspapers presented to the Institute have used such values and we have 1 Determining Moisture in Air Blast, Iron Trade Review, vol. xlvii, No. 26, p. 1205(Dec. 29, 1910). 2 Weather Bureau Bulletin No. 235, U. S. Depart
Transactions . ater accompanying a pound of dry convenient this may be for heating and ventilating workand other engineering problems, there are several reasons for prefer-ring the use of a value expressed in grains of water in a cubic foot ofmixed air and water vapor, in connection with combustion phenomenaand the effects of moisture on blast-furnace operation. Previouspapers presented to the Institute have used such values and we have 1 Determining Moisture in Air Blast, Iron Trade Review, vol. xlvii, No. 26, p. 1205(Dec. 29, 1910). 2 Weather Bureau Bulletin No. 235, U. S. Department of Agriculture. 8 Willis H. Carrier : Eational Psychrometric Formula?. Transactions of the AmericanSociety of Mechanical Engineers, vol. xxxiii, pp. 1005 to 1039 (1911). 4 See discussion of paper by Bruce Walter, An Improved Method of Drying Air for BlastFurnaces, Proceedings of the Engineers Society of Western Pennsylvania, vol. xxviii, No. 4,p. 292 (May, 1912). 428 CHART FOR PSYCHROMETRIC 18 CHART FOR USE IN MAKING PSYCHROMETRIC DETERMINATIONS USING WET AND DRY BULB THERMOMETERS. (BASED ON CARRIERS RESEARCHES) Dry Bulb Temperatures-Read on vertical lines. Wet Bulb Temperatures—Read oiv slant lines. Grains Moisture in a volume of mixed Air and Water Vapors-equiva lent to a Cubic Foot measured at Standard Conditions — Read on horizontal lines. 15 14 20 30 40 50 00 TO 80 90 100 110 DRY BULB TEMPERATURES Fig. 1.—Chart fob Use in Making Psychrometric Determinations. CHART FOR PSYCHROMETRIC DETERMINATIONS. 429 become somewhat familiar with the effects of moisture, as expressedin terms of grains per cubic foot of air, on furnace operation. It can be shown that the theoretical temperature of combustion ofcarbon varies in almost exact proportion to the amount of moisturepresent in a cubic foot of the mixed air and water vapors, while therelation becomes much more complex when the amount of water isexpressed in grains accompanying a pound of dry air. For the
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