. Electrical news and engineering . outthe same time and at different times since pans havebeen tried with some success, but was never equal tothe tower system. The next was a partition tower, or aboard filling. This has taken a great many shapes, theboards being arranged to break up the water and aircurrents in every conceivable manner. Sheet iron hasbeen tried in various forms, some like stove pipes andothers arranged in sheets. The latest and best fillingis tile and wire netting. The tile tower has been described in Power and othermechanical papers. It is very satisfactory. One pointagainst
. Electrical news and engineering . outthe same time and at different times since pans havebeen tried with some success, but was never equal tothe tower system. The next was a partition tower, or aboard filling. This has taken a great many shapes, theboards being arranged to break up the water and aircurrents in every conceivable manner. Sheet iron hasbeen tried in various forms, some like stove pipes andothers arranged in sheets. The latest and best fillingis tile and wire netting. The tile tower has been described in Power and othermechanical papers. It is very satisfactory. One pointagainst this filling for a large tower is its great wire or Barnard tower is filled with wire nettingrolled up loosely and set up on end. In these towers asettling chamber is provided at the bottom, and a heavygrating is placed across some distance above the this space the fan discharges its air. On top of thegrating is placed the tile or wire, whichever filling isused, and it is continued on up as far as it is able to. PATENT COOLING APPARATUS, .^S ARRANGED ROOF OF A BlILDING. support itself, breaking joints, so as to break up thestreams of water. There is a portion of the towercarried on up above the filling, to allow the particlesof water to settle out of the air current. This preventsa spray flying from the top of the tower, and also anyof the water being wasted. Information on the formulafor calculating the size of towers is not very extensivelyknown. As far as can be learned, about 50 squarefeet of cooling surface is required per , when a largequantity of air is used, say 100 cubic feet of air , and varies with the amount of air and with thearrangement of the filling. In making up estimates theterm does not give definite information, because theamount of steam used per h p. varies from 15 to 45 per hour, according to the size and type ofengine. The only way is to get the water consumption CflNflDlflN HbEGTRlC
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