. The street railway review . as afiltering medium, separating the particles of dirt and absorbingany water. As the oil emerges from the press it is free from alldirt and is but little discolored. During the process of filtering, some cylinder oil finds its wayinto the engine oil, which discolors it, from an amber to a deepwine color. This cylinder oil increases the specific gravity of theoil but after it has passed through the filter press, the gravity testis the same as for new engine oil, the press having removed someof the residium. tar. wax, etc. IMPROVED AIR PUMP AND CONDENSER. The accom
. The street railway review . as afiltering medium, separating the particles of dirt and absorbingany water. As the oil emerges from the press it is free from alldirt and is but little discolored. During the process of filtering, some cylinder oil finds its wayinto the engine oil, which discolors it, from an amber to a deepwine color. This cylinder oil increases the specific gravity of theoil but after it has passed through the filter press, the gravity testis the same as for new engine oil, the press having removed someof the residium. tar. wax, etc. IMPROVED AIR PUMP AND CONDENSER. The accompanying illustration shows the latest design of thejet condensing apparatus for street railway power plants, that hasbeen developed by the Dean Bros. Steam Pump Works, of In-dianapolis, Ind. The power required for the operation of thispump is given as one-hall of one per cent of that developed in theengine, while the steam consumption of the latter is reduced 30per cent. This air pump can be speeded to deliver just the amount. 471 DEAN AIR PUMP AND CONDENSER. of water required for condensation. It is started before the engineand the vacuum obtained is used to assist in the first feature is important with compound engines, as the full powerof the low pressure cylinder is secured at once. It was formerly supposed that a vertical air pump must be single-acting, but the manufacturers have designed a double-acting, ver-tical air pump that is believed to be entirely successful. The ver-tical type of air pump is said to be much more durable than thehorizontal type, because there is no side wear in the cylinder and stuffing boxes. In horizontal pumps, especially large sizes, thereis a constant downward wear of piston and rods, due to theirweight. Any sediment in the water will settle on the lower sideof the cylinder, where this pressure is greatest, causing the pistonand cylinder to wear rapidly. The vertical air pump occupiesbut little floor space, and it is much more
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
