. American engineer and railroad journal . shaft project-ing through the floor under the middle of the table derivesits motion from the car axle by means of spiral gears andbevel gears. Its motion is transmitted, by means of the gearsshown, to the speed gauge and to the paper driving last consists simply of a pair of driving rollers, aroundwhich the paper passes, and a supply roller and receivingroller. The paper is drawn from the former and fed to thelatter after running over the drum of the recording gaugeseen also at the left. In addition to this apparatus the car is equipped


. American engineer and railroad journal . shaft project-ing through the floor under the middle of the table derivesits motion from the car axle by means of spiral gears andbevel gears. Its motion is transmitted, by means of the gearsshown, to the speed gauge and to the paper driving last consists simply of a pair of driving rollers, aroundwhich the paper passes, and a supply roller and receivingroller. The paper is drawn from the former and fed to thelatter after running over the drum of the recording gaugeseen also at the left. In addition to this apparatus the car is equipped, for loco-motive road tests, with gauges for indicating and recordingboiler pressure and steam-chest pressure, duplex air gauge,air brake train line pressure recording gauge, and the otherapparatus used in locomotive tests. The track inspection appa-ratus and other apparatus are to be installed later. 242 AMERICAN ENGINEER AND RAILROAD JOURNAL. BOILER AND FRAMES—TWELVE-WHEELLOCOMOTIVE. FREIGHT Illinois Central R. R. Built by the Brooks. Locomotive Works. The largest locomotiveboiler ever built* seems■worthy of illustration onaccount of its size if it wasnot otherwise locomotive built forthe Illinois Central by theBrooks Locomotive Workswas illustrated in October,1899. page 315. and wenow show the boilerand frames. Attentionhas already been called tothe high boiler pressure,210 lbs., and the thicknessof the sheets. The boileris 82 inches in diameter atthe front end and 85 inchesover the smokebox. It is90 inches wide at the fire-box. The boiler is thec Player Improved Bel-■*; paire type. The heatingsurface is 3,500 square feetand the grate area feet. The heatingsurface is large but it hasbeen exceeded. The gratearea is very large for anarrow firebox engine, thelength being 11 feet. Theboiler is very high abovethe rails, the center being9 ft. 8 in. above the railtops. This is the highestof which we have record,the Great Northern 12-wheel engines,


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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering