. American engineer and railroad journal . by 61/2 in., the main driving journals are 7by 9 in., the crank axle journals are 7% by 5V^ in. and theabsence of eccentrics, due to the use of the Joy valve gearsaves the space ordinarily occupied by these parts for otherpurposes. Fig. 4 shows the application of the central frameto .six coupled freight engines with 18 in. cylinders and 60in. wheels. The outer springs in this design are of % steel with left-hand coiling, while the inner springsare coiled the other way and are made of 7/16 in. square springs are 9% in. long before
. American engineer and railroad journal . by 61/2 in., the main driving journals are 7by 9 in., the crank axle journals are 7% by 5V^ in. and theabsence of eccentrics, due to the use of the Joy valve gearsaves the space ordinarily occupied by these parts for otherpurposes. Fig. 4 shows the application of the central frameto .six coupled freight engines with 18 in. cylinders and 60in. wheels. The outer springs in this design are of % steel with left-hand coiling, while the inner springsare coiled the other way and are made of 7/16 in. square springs are 9% in. long before compressing. Photographs of the main and rear driving wheels and axlesare shown in Figs. 2 and 3. These show the driving journals,which are large for English practice and for which this con-struction provides. The method of balancing both pairs ofdriving wheels is shown in the photographs. Mr. Webb findsno difficulty in casting these 7 ft. 1 in. wheels, and does notfind it necessary to cut the rims as is generally done in this ^ Stads ;. Fig. 4.—Webbs Central Frame fc Four-Cylinder Compounds. country to prevent the spokes from contracting away fromthe rim. It will be observed that the axle is built up. Thispermits of using qualities of steel for each part that are bestadapted for its purpose. The crank arms are of nickel steel,while chrome steel is used for the bearings, and crank special tools for making them, these tools cost but lit-tle more than if forged solid and cut out in the usual way. These engines have two 15 in. high-pressure cylinders out-side of the frames and two 20% in. low pressure cylinders, allhaving 24 in. stroke. One pair of cylinders on each side, in-cluding one high and one low pressure cylinder is operated bya single valve gear, the motion for the low pressure valvesbeing transmitted by a rocking lever from the front end of thehigh pressure valve stem. The House Naval Committee has reported an appropriationof over $61,000,000 for expenditure
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
