. The science of railways . JnterceptiTLff Tali/e Operv moves to and fro in a cylinder having four open-ings. The two large openings shown lead fromthe receiver to the low-pressure steam chest (seeFig. 135) and are closed by the two interceptingpistons GG when the engine is to be started, sothat live steam may be admitted to the low- OPERATION OF COMPOUND LOCOMOTIVES. 215 pressure cylinder without producing a backpressure in the high-pressure cylinder throughthe receiver. Of the two remaining openings inthe valve cylinder, port D leads to the low-pressurestorim chest and port F admits steam fr
. The science of railways . JnterceptiTLff Tali/e Operv moves to and fro in a cylinder having four open-ings. The two large openings shown lead fromthe receiver to the low-pressure steam chest (seeFig. 135) and are closed by the two interceptingpistons GG when the engine is to be started, sothat live steam may be admitted to the low- OPERATION OF COMPOUND LOCOMOTIVES. 215 pressure cylinder without producing a backpressure in the high-pressure cylinder throughthe receiver. Of the two remaining openings inthe valve cylinder, port D leads to the low-pressurestorim chest and port F admits steam from theboiler when the apparatus stands in position asshown in Fig. The back end of the intercepting i)iston-rodpasses through suitable stuffing boxes to a smallcylinder provided with a piston //, which actuatesthe intercepting valve. This cylinder has a smallsteam chest, slide valve and admission and exhaust 216 ENGINEERS AND FIREMENS MANUAL. ports SO similar to those of an ordinary locomo-tive cylinder, that its operation will be made plainby referring to the Figs. 133 and 134, if the move-ments of its slide valve are explained. This f^ciJt/e. Open
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