. Railway mechanical engineer . mitting the airfrom the shop line to enter the large cylinder. The differ-ence in the diameter of the cylinders creates a pressure ofwuler over two and one-half times that of the air, thus per-mitting a 250-lb. test pressure to be obtained. A pressuregage is located in one end of the header block. After the testhas been made the air pressure is removed and the systemis drained througli the valve H. Two header blocks are made,one with the holes .1 and B 3 j^ in. apart, and one with them4 in. apart, for two styles of superheater unit tubes connections on
. Railway mechanical engineer . mitting the airfrom the shop line to enter the large cylinder. The differ-ence in the diameter of the cylinders creates a pressure ofwuler over two and one-half times that of the air, thus per-mitting a 250-lb. test pressure to be obtained. A pressuregage is located in one end of the header block. After the testhas been made the air pressure is removed and the systemis drained througli the valve H. Two header blocks are made,one with the holes .1 and B 3 j^ in. apart, and one with them4 in. apart, for two styles of superheater unit tubes connections on both blocks are made the same, so as to beinterchangeable with the rest of the apparatus. These blocksare made of cast iron. A CENTERING MACHINE BV E. F. GL.\SS The accompanying sketch shows a device for centeringpins of larger diameters than can usually be accommodatedon the ordinary centering machine. In use it has proved tolie Ijoth rapid and accurate. It is made of a small speed lathe, fitted with a sliding /r.$ Iron Stand. 3f Sfd. Tapped Cap Hydraulic Tester for Superheater Uni^ 250 lb. per sq. in. The large cylinder of 3^ in. diameter ismade from steel tubing. In this is located the cast ironiplunger, the other end of which operates in the other cylinder•of ZVi in. diameter, also made from steel tubing. The unitipipes are clamped to the header block C by a bolt. Water from the shop supply is admitted tlirough the valve spindle and lever.; It has a head block .4, which lias a taperbore varying in .diameter from 1>4 in. to oji in. The largerdiameter of the bore sliould be 1-16 in. greater than the headof the largest pin tabe-center£ pinsfrom the largest to .the sniallest . of the bore in. the-,head block without any adjustment anil if desired, an 154 RAILWAY MECHANICAL ENGINEER Vol. 9L No. 3 iliary bushing which is turned to fit the block as shown atB, may be applied for smaller work. In operating the machine it is only necessa
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
