. Revised and enlarged ed. of the science of railways . End View of Re-versing Gear. DESCRIPTION OF LOCOMOTIVE. 91 of the engine. This arm is connected by a re-versing rod to a reversing lever, worked by theengineer in the cab of the locomotive. Its move-ment raises or lowers the link. The method of governing the action of the slide valves and the admission of steam to the cylinders (and conseqnent smooth operation and economical working of the ^■^^~~^-J machine, or otherwise) evinces ^ / the skill of the engineer. / How this skill is exercised in. Engineers Lever In Connection with Reversing
. Revised and enlarged ed. of the science of railways . End View of Re-versing Gear. DESCRIPTION OF LOCOMOTIVE. 91 of the engine. This arm is connected by a re-versing rod to a reversing lever, worked by theengineer in the cab of the locomotive. Its move-ment raises or lowers the link. The method of governing the action of the slide valves and the admission of steam to the cylinders (and conseqnent smooth operation and economical working of the ^■^^~~^-J machine, or otherwise) evinces ^ / the skill of the engineer. / How this skill is exercised in. Engineers Lever In Connection with Reversing Gear. controlling the expansion of the steam in thecylinder rather than the opening and closing ofthe valve which admits steam into the cylinder,can not be explained with sufficient perspicuityto be of sensible aid to the student. The sub-ject is pre-eminently one of practical knowledge,and little can be gained from books by the newbeginner. I do not esteem it desirable or necessary tofurther descril^e the apparatus by which theaction of the piston in the cylinder is broughtto bear on the driving wheel, and so on the train. 92 RAIL^VA Y EQUIPMENT. All the connecting rods and shafts must, it isapparent, be relative in length, size and strengthto the othei- parts of the machine; harmony mustexist throughout. This is true also of the boilerand cylinders, which must be proportionate tothe load to be hauled and the speed to be at-tained. These details, incomprehensible to thenovice, are achieved by following well-knownpractices of construction,
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