. Railway age gazette . een the 20 in. and 29 in. cylinder, the cylinder volumehas been more than doubled, but the port area has been in-creased only about 40 per cent. A 29 in. cylinder would re-quire a 22 in. valve to give a port area at 25 per cent cutoff ofequal ratio to the cylinder volume that an 11 in. valve bears toa 20 in. cylinder. It would appear from this that the large engines have out-grown the capacity of the Walschaert gear and that they arenot developing the hauling capacity at high speeds that theywould be capable of with a freer inlet and outlet of steam. Itis for this purpo
. Railway age gazette . een the 20 in. and 29 in. cylinder, the cylinder volumehas been more than doubled, but the port area has been in-creased only about 40 per cent. A 29 in. cylinder would re-quire a 22 in. valve to give a port area at 25 per cent cutoff ofequal ratio to the cylinder volume that an 11 in. valve bears toa 20 in. cylinder. It would appear from this that the large engines have out-grown the capacity of the Walschaert gear and that they arenot developing the hauling capacity at high speeds that theywould be capable of with a freer inlet and outlet of steam. Itis for this purpose, largely, that the Young gear has been de-signed, and it is anticipated that it will be found of especialvalue on very large locomotives. MOTOR DRIVE FOR BEAUDRY HAMMERS . improvement recently added to the line of Peerless ham-mers manufactured by Beaudry & Company, Inc., 141 Milk street,Boston. Mass., is the provision for a motor drive. -A descriptionof these hammers was published in the .-Xmerican Engineer of. Beaudry Hammer Equipped with IVIotor Drive October, 1912, page 541. The addition of the motor drive makesbut few changes necessary in the construction of the hammer,ders have 314 sq. in. of piston area. A 29 in. cylinder has 660 the principal ones being the addition of a supporting frame for Janl-arv, 1914. RAILWAY AGE GAZETTE, MECHANICAL EDITION 4S the motor and the placing of the driving pulley outside the bear-ings on an extension of the shaft. These are both clearly shownin the illustration. CROSS-SLIDE FLAT TURRET LATHE Among the more interesting of the recent machine tools isthe cross-slide Hat turret lathe designed by the Modern MachineTool Company, Cincinnati, Ohio. This company has been build-ing a flat rigid turret lathe for some time, which has been verypopular and successful, and the new lathe differs from the rigidmodel only in those features of the carriage and turret directlyconnected with the cross slide. Extra heavy cuts and the use of a gang of tool
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroa, bookyear1913
