. The science of railways . 176 ENGINEERS AND FIREMENS MANUAL. engineer is likely to work simple any longer thanabsolutely necessary, is about the same as sayingthat an engineer with the ordinary engine cannotbe trusted to pull the reverse lever up as soon aspossible. Later practice interposed, within or near theintercepting valve, a reducing valve, which isused to admit live steam, at a reduced pressureonly, into the low-pressure cylinder when startingor when working simple. This reduced the abnormal shocks that wereproduced when startinglarge compounds of earlierdesign. The reducingvalve, th
. The science of railways . 176 ENGINEERS AND FIREMENS MANUAL. engineer is likely to work simple any longer thanabsolutely necessary, is about the same as sayingthat an engineer with the ordinary engine cannotbe trusted to pull the reverse lever up as soon aspossible. Later practice interposed, within or near theintercepting valve, a reducing valve, which isused to admit live steam, at a reduced pressureonly, into the low-pressure cylinder when startingor when working simple. This reduced the abnormal shocks that wereproduced when startinglarge compounds of earlierdesign. The reducingvalve, the interceptingvalve, and the separate/^~^\ exhaust valve were so. (-^^y closely combined in many^---^ cases and so dependent,one upon the other, intheir operation, that itbecame the tendencyamong railway and me-chanical men to refer to the w^hole mechanismsimply as the intercepting valve. While the limit to the size of the ordinarylocomotive may be considered to have beenreached w^hen the largest practical boiler that canbe placed on a given gauge track has been attained,the limit to the American two-cylinder, or cross-compound, with outside cranks Will be the max-imum w^dth allowable for locomotives. However,again Mr. Mallet, the father of the present era CLASSES OF COMPOUND LOCOMOTIVES. 17 of compound locomotives, has seemingly solvedthe problem by dividing the low-pressure cylinderinto two cylinders, as shown in Fig. 105, of smallersize attached to the same crosshead. With sucha construction it would appear that the boilerwould still be the limiting feature of the size ofthe compound as well as the simple proper cylinder ratio of c
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