. Revised and enlarged ed. of the science of railways . Side View. Section. Cylinder Relief DESCRIPTIOX OF LOCOMOTIVE. 115 size of this opening, but as the link motion,already described, allows the expansion to bevaried at ^Yill, the throttle-valve is kept openand the speed controlled by varying the amountof the expansion. Such are the details of the modern locomotive.*The reader will notice that I have not attemptedto exhaust the subject. To understand the loco-motive requires intelligence, study and greatpractical knowledge. Nothing that can be saidin books about the construction and
. Revised and enlarged ed. of the science of railways . Side View. Section. Cylinder Relief DESCRIPTIOX OF LOCOMOTIVE. 115 size of this opening, but as the link motion,already described, allows the expansion to bevaried at ^Yill, the throttle-valve is kept openand the speed controlled by varying the amountof the expansion. Such are the details of the modern locomotive.*The reader will notice that I have not attemptedto exhaust the subject. To understand the loco-motive requires intelligence, study and greatpractical knowledge. Nothing that can be saidin books about the construction and operationsof the locomotive is of particular value to anengineer or fireman; but a description of thelocomotive, even so imperfect as that embracedin the foregoing chapter, is of the greatest pos-sible interest and value to other railway men,who have neither the opportunity, time norinclination to become practical engineers, butwho have a desire, and it is to the interest ofevery railway company that they should havethe power, to acquaint themselves with the vari-ous parts of the locomotive an
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