SOME COMMON MECHANICAL MOTORS 



573 



An ingenious device called the ECCENTRIC on the shaft of 

 the flywheel operates the slide valve, S-V. Just as the piston 



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FIG. 358. An upright boiler 

 with casing cut away, showing 

 the tubes. 



FIG. 359. An upright boiler 

 with the engine attached to the 

 side of the boiler. 



FIG. 360. A horizontal tubular boiler with the engine mounted on top. 



reaches the left end of the cylinder, the slide valve is moved 

 far enough to the right to admit the steam to the left end of 



