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SCIENCE 



LEntered at the Post-Offlce of New York, N.Tf ., as Second-Class Malter.J 



A WEEKLY NEWSPAPER OF ALL THE ARTS AND SCIENCES. 



Eighth Year. 

 Vol. XV. No. 363. 



NEW YORK, February 21, 1890. 



Single Copies, Ten Cents. 

 3.50 Per Year, in Advance. 



THE TRIUMPH COMPOUND STEAM-ENGINE. 

 The ateam-engine shown in the accompanying illustrations is 

 of a novel and ingenious design. The aim of the builders has 

 been to produce a valveless compound engine, and that they have 

 succeeded admirably in designing and building such a machine is 

 admitted by all whose experience wilh steam-engines enables them 

 to judge. 



through tbe cylinder casting, it is evident that the omission of the 

 valves has not led to troublesome complications in other directions. 

 In the illustrations, Fig. 1 is a vertical longitudinal section 

 through the engine, Fig. 3 is a vertical cross-section thTOugh the 

 same, Fig. 3 is a horizontal cross-section through the live-steam 

 ports, and Fig. 4 is a horizontal cross-section through the expansion 

 parts. 



FIG. I —TRIUMPH COMPOUND VALVELESS STEAM-ENGINE. 



The engine shown, which is built by the Triumph Compound 

 Engine Company of Cincinnati, has three high and thrte low 

 pressure cylinders, each with single-acting pistons. Each high- 

 presjsure piston controls the steam-supply to its own cylinder and 

 that of one of the low-pressure cyhnders. The e.xhaust is also con- 

 trolled in the same manner ; so that the high-pressure pistons do 

 double duty, acting as pistons and as valves. As the latter ofiice 

 is performed by means of passages through the piston heads and 



H' H' H'" are higli-pressure and L' L" L" are low-pressure 

 cylinders, and the pistons acting iu each will be referred to by the 

 same letters. Tbe pistons are connected directly to the shaft by 

 connecting-rods without the intervention of piston rods; and the 

 cranks are set at an angle of 120 degrees with each other, in which 

 pjsJtion all the moving parts are perfectly balanced. 



Pistons //■ and L" are shown on the upper centre, pistons fl' 

 and L' being 120 degrees in advance, and pistons H" and L'" 130 



