18 ; STATIONARY ENGINES . pump necessitates the use of a separate suction pipe , which is fitted to the side of the valve ehest placed underneath the suction valve . Side - lever engines have been introduced with the object of re - ducing the great height of the massive lever wall for carrying the … main beam , and of simplifying the engine by dispensing with the expensive parallel motion . The arrangement possesses certain advantages ; the main one being that the engine is self - contained , having a bed plate for carrying the cylinder , main pillow blocks , condenser , air pump , & c . The…
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