. The science of railways . partially equalize thepower of compounds, the amounts of lap and leadare not the same for both cylinders; one builderuses a separate lever in the cab for independ-ently adjusting the travel of the low-pressurevalve, as fully described elsewhere. There seems to be no general rule followed by builders in this countryas to which cylinder ofa two-c y 1 i n d e r com-j)ound should be placedon the right-hand orengineers side of theengine. Generally theintercepting valves arelocated on the engi-neers side to make theirconnections as simple aspossible, and hence, ac-cording
. The science of railways . partially equalize thepower of compounds, the amounts of lap and leadare not the same for both cylinders; one builderuses a separate lever in the cab for independ-ently adjusting the travel of the low-pressurevalve, as fully described elsewhere. There seems to be no general rule followed by builders in this countryas to which cylinder ofa two-c y 1 i n d e r com-j)ound should be placedon the right-hand orengineers side of theengine. Generally theintercepting valves arelocated on the engi-neers side to make theirconnections as simple aspossible, and hence, ac-cording as the design^ * contemplates the plac- ing of this valve adjacent to the high or the low-pressure cylinder, that one is placed on the right-hand side. But even this rule is not withoutexception.* *It would seem as though the intercepting valve, if placedbetween the high-pressure cylinder and the receiver, would causeless wiredrawing of steam to the low-pressure cylinder than iflocated between the latter and the 180 ENaiNEERS AND FIREMENS MANUAL. Some compounds have cylinder casings both ofthe same size, but with the advent of the thirty-four or thirty-five inch low-pressure cylinder itseemed to many advisable to place it on theengineers side with the thought of its better pro-tection from damage if within his vision, and, fur-thermore, that the high-pressure cylinder casingbe made no larger than necessary for reason ofits better protection from accident. It is becoming the general practice on com-pounds of any size to place combination safety andrelief valves on the receiver and the low-pressurechest and cylinder heads to avoid damage in caseof broken reducing valve or other accident thatmight produce unsafe pressure on that side. CHAPTER IV. ENGINEERS^ AND FIREMENs MANUAL QUESTIONS AND ANSWER3 ON THE OPERATION OF COM-POUND LOCOMOTIVES IN GENERAL. In what respects should the instructions forfiring compound locomotives differ from those forsingle-expansion engines,
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