. Le journal de chemin de fer et d'ingénierie . n. Diamètre du tourillon d'essieu moteur principal SJ-^ longueur du tourillon d'essieu moteur principal 6^8* diamètre des roues du chariot 2* 6 distance entre les centres des roues motrices. 5 o distance entre les centres des roues du camion 4 8 empattement total du moteur 16 o diamètre des cylindres 12 course des cylindres 16 diamètre extérieur du plus petit anneau de chaudière 3 6 utilisé sur les routes surélevées, qui est plus léger que celui des voitures de tourisme utilisées sur les lignes ordinaires. Dans toutes les conditions, ces moteurs ont bien fait leur travail, et semblent être très bien adaptés au service. LE DE
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. The railroad and engineering journal . n. Diameter of main driving-axle journal SJ-^ Length of main driving-axle journal 6^8* Diameter of truck-wheels 2* 6 Distance between centers of driving-wheels.. 5 o Distance between centers of truck-wheels 4 8 Total wheel-base of engine 16 o Diameter of cylinders 12 Stroke of cylinders 16 Outside diameter of smallest boiler ring 3 6 in use on the elevated roads, which is lighter than that ofthe passenger cars employed on ordinary lines. Underall conditions these engines have done their work well, and appear to be very well adapted to the service. THE DEVELOPMENT OF ARMOR. By First Lieutenant Joseph M. Califf, Third U. S, Artillery. (Copyright, 1889, by M. N. Forney.) (Continued/ram page 572, VolttnteLXllI.) VI.—STEEL ARMOR. Steel has been, almost from the first, the favorite ma-terial for armor-plates with the French, and the solid steelplate turned out by Schneider & Company at the CreusotWorks is by all odds the superior of anything in the wayof steel armor ever yet produced.. LOCOMOTIVE FOR THE MANHATTAN ELEVATED RAILROAD.BUILT BY THE NEW YORK LOCOMOTIVE WORKS, ROME, N. Y. Length of fire-box inside 4 ft. 73*9 lbs. Width of fire-box inside 3 7 Depth of fire-box, crown-sheet to top of grate 2 iiK Number of tubes 154 Outside diimeter of tubes r^ in. Length of tubes 6 ft. 3^^ * Grate surface 16.43 sq. ft. Heating surface, fire-box 55-77* Heating surface, tubes... 375-15 Heating surface, total 430.92 Size of steam-ports 8^X0% in. Size of exhaust-ports SJiXlJi Throw of eccentrics SX Greatest travel of valve 3% Outside lap of valve c5e Smallest inside diameter of chimney loj^ Height, top of rail to top of chimney 12 ft. 1 Height, top of rail to center of boiler 5 5%* Water capacity of tank 600 galls. The exhaust-nozzles are single, and are carried up high ;they are bored out 4 in. in diameter. The fuel used isanthracite coal, as on all the engines of this line. The service in which these locomotives are employed isof a difficu
