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A NEW LINE OF AIR COMPRES- SORS. The accompanying illustrations show features of a new line of air com- pressors which have recently been placed on the market by the Thos. H. Tae Marine REVIEW larger sizes, the air cylinder is sup- ported on a pedestal, while the tie piece is of circular section without the foot piece. Ample openings are pro- vided to permit adjustment of the stufing boxes and tightening of the FIG, 1--SINGLE STEAM-DRIVEN COMPRESSOR. Dallet Co., Philadelphia. These com- pressors have developed several new» ideas in compressor design. All parts requiring adjustment or renewals are readily accessible and a liberal amount: of metal has been used where needed to insure rigidity in operation. . The frame is of the open fork cen- ter crank type, and is of massive de- sign to permit on each size of com- pressor, when desired, a greater range of capacity by substituting a cylinder of the next larger size than the stand- ard to operate at 100 pounds pressure. Thus, a 10-inch cylinder may be placed on an 8-inch compressor frame, giv- ing somewhat increased capacity at slightly greater first cost. The line of compressors designed comprise both steam and belt-driven machines of the straight line and duplex types. In the case of duplex compressors with compound steam cylinders, a reducing valve has been inserted between the high pressure steam pipe and the low pressure cylinder, enabling live steam to be fed to the low pressure cylinder for starting purposes, when the high pressure cylinder thas stopped on a dead center. Air and steam cylinders are tied to- gether and held in position, by means of an internally flanged distance piece. On the smaller sizes, this piece sup- ports the air cylinder, but on the ' cold weather. cylinder stud nuts. In the air cylin- ders, clearance space is reduced to a minimum, and all heads and cylinder walls are water jacketed. Means are provided for draining the cylinder and cylinder head jackets, an essential in _ Lubrication is effected by feeding oil into the intake passage, whence it is carried by the suction into the cylinder in the form of a spray. Mechanically-operated inlet valves are supplied onall sizes of com- pressors, when desired. The valves 55 are ground to gage, and the valve holes lapped to size. These com- pressors are suitable for vacuum ser- vice, and are furnished with mechan- ically-operated inlet valves for high vacuum. The intake valve is of the automatic poppet type, and is contained in a mal- leable iron cage, which is in one piece and combines both the seat for the valve and the guide for the valve stem. The cage is threaded and screws into the wall of the air intake chamber only. It seats in a recess of the main cylinder wall, and has thin corrugated copper gaskets to secure a tight joint. The valve cage cap acts as a lock nut for holding the cage in place after it has been screwed down to its seat in the cylinder. In the case of a com- pound machine, corrugated. copper gas- kets are placed under the valve cage caps on the high pressure cylinder to insure against any leakage. The valve proper is a hardened special alloy steel, with seat and stem ground to gage. The spring holder comprises a split taper ring set into a recess on the valve stem and held together and tight to the stem by means of a solid taper ring slipping down over it. The hammering of the valve on its seat tends to tighten the spring holder on the stem instead of driving it off. This eliminates any tendency of the spring holder to shear off or work loose from the stem. The discharge valve is of the automatic poppet type, and is contained in a valve cage of malleable iron. The method of seat- ing in its cylinder and locking to its seat is identical with that of the in- take valve. The inter-cooler is of large cooling . area, and employs the return flow type FIG. 2--SECTIONAL ELEVATION OF. SINGLE. STEAM COMPRESSOR.