Show mysteries hysten es 0 of the BY FRANK frani RICHARDS A man who knows writing in his usual entertaining way in the salt lake mining review september 30 kindly mentions my name and seems to invite me to assist him in enlightening the world as to the mysteries of the on the air compressor mysteries seems to be quite the correct word to use in connection with the of A man the man who knows but unfortunately his disquisitions only set forth the mysteries without suggesting satisfactory explanations the latter task apparently devolving upon me it will be remembered that in a former article by the man who knows we were introduced to a new and special kind of atmospheric mo air free air which in compression under the manipulations of the man who knows presented phenomena which do not occur when ordinary air is compressed in ordinary compressors with ordinary inter coolers hot wet compressed air that burns the oil on the valves even though occurring only when the practice is bad seems to be known only to the man who knows but now we have another mystery to me more perplexing the man who knows I 1 would be glad to use a shorter name tells us with very satisfactory of the water record of a certain two stage air compressor which he has run for several years this compressor was of 1000 cubic feet free air per minute capacity and it is of course assumed that the performed its function of reducing the temperature pera ture of the air after the first stage of its compression with high efficiency the circulating water for the was contained in a tank holding when nearly full say 2500 gallons of water and this water passed from near the bottom of the tank through a duplex pump at the rate of about thirty gallons per minute then through the and up to the top of the tank the same water thus being used over and over in using the water under this arrangement from november to april ast 1st which was days the total waste of water we are told was only gallons or one and one third gallons in twenty four hours this waste covering all possible leakages of the tank at the pump and elsewhere also all evaporation and water must and will evaporate in winter as at any other time if it has heat to get rid of apparently also the water did not get dirty we are told moreover that the water did not warm up in the winter sufficiently to prevent trouble from freezing and as we read the narrative we cannot help suggesting that it would have been a proper thing to have connected a steam pipe to the tank for the purpose of heating the cooling water in an earlier portion of the article which we are considering there are some remarks that I 1 confess are to me unintelligible about the pressure of the water passing through the I 1 do not see that it makes any difference whether the pressure be one pound or fifty pounds the measure of the cooling effect accomplished is in the raising of the temperature of the water and in the volume of water whose temperature is so raised the heat by which this is effe effected C t e d being just the amount of heat abstracted from the air or the actual amount of cooling efrom the air if the air in the compressor of the man alan who knows is efficiently cooled by the cir cu dilation lation oll 0 a smaller quantity of water and laith with a smaller rise of the temperature of this smaller quantity of water then it is absolutely sol certain that the man alan who knows uses a special kind of water with which the rest of us are not acquainted |