. Revised and enlarged ed. of the science of railways . The Exjieriment, built by John B. Jervis,i!i 18:^:2, and said to have been the first enginein America constructed with a four-wheeledbogie. EVOLUTION OF LOCOMOTIVE. 51 construction. Jervis believed engines should bemade especially for light rails and crooked roads,and the adoption of the swiveling or bogie truckwas the result. It was a great step, of enormousvalue to railroads, its merits are now appre-ciated all over the world. Equalizing Levers. — The first engine withequalizing levers are said to have been builtby Henry R. Campi)e
. Revised and enlarged ed. of the science of railways . The Exjieriment, built by John B. Jervis,i!i 18:^:2, and said to have been the first enginein America constructed with a four-wheeledbogie. EVOLUTION OF LOCOMOTIVE. 51 construction. Jervis believed engines should bemade especially for light rails and crooked roads,and the adoption of the swiveling or bogie truckwas the result. It was a great step, of enormousvalue to railroads, its merits are now appre-ciated all over the world. Equalizing Levers. — The first engine withequalizing levers are said to have been builtby Henry R. Campi)ell of Philadelphia, in 1887,called the Hercules. The enjj^ine was built. The Ilercules. 1837. Built by Eastwich .t Harrison,having equalizing leverf;. The first engine with four drivers and a four-wheel truck in front,and under the rear end of the main frame a sep-arate frame was placed for the two axles—onepair in front and one behind the fire-box. Thisframe supported the >veight of the engine bymeans of strong springs and was held in positionby a pedestal fastened to the main frame. Thecenters of the latter vi])rated upon a journal slid-ing vertically in the pedestal. By means of theequalizing lever the weight of the engine is 52 RAILWAY EQUIPMENT. equally distributed on all the driving wheels,even during their vertical oscillations when pass-ing over imperfect track, thus greatly overcom-ing the tendency of locomotives to leave thetrack when the latter is rough. Boilers. — The early locomotive boilers werecopied from vertical and horizontal stationaryboilers and were not adapted especially to the
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