. American engineer and railroad journal . indebted to The Engineer: The assistant cylinder, as its name implies, assists the drivingof the slide valve, and thereby relieves the eccentrics and gear ofthis work, taking the place of the ordinary balance cylinder, andin some cases, being much smaller than the latter, has been ac- tually placed within the balance cylinder casting. It will beseen that it is practically an engine having admission, cut-off,compression, and release, the piston forming the valve to givethe required regulation, while being attached directly to thevalve spindle its strok
. American engineer and railroad journal . indebted to The Engineer: The assistant cylinder, as its name implies, assists the drivingof the slide valve, and thereby relieves the eccentrics and gear ofthis work, taking the place of the ordinary balance cylinder, andin some cases, being much smaller than the latter, has been ac- tually placed within the balance cylinder casting. It will beseen that it is practically an engine having admission, cut-off,compression, and release, the piston forming the valve to givethe required regulation, while being attached directly to thevalve spindle its stroke varies with that of the valve itself, sothat when the engines are linked up, the cylinder obtainsless steam and only does work proportionate tothe requirements of the valve gear, no individualattention being required. In most warships, where the spacebetween the top of the valve cbast and the under side of the deckbeams is very limited, an arrangement, aa shown, i. e., formingthe cover joint some way down the aylinder wall, is adoptedI. Joys Assistant Cylinder,with satisfactory results, enabling the cylinder to be overhauledwithout taking any of the gear apart; in one instance a cy Underhaving a stroke of 7 inches was fitted within an available spaceof only 16A inches. Owing to the rapidly increasing size of engines, combined with higher piston speeds and steam pressureson modern high-class engines, some means of overcoming theinertia of the valves at the beginning of the stroke, and checkingthe momentum at the end, other than by the eccentrics and rods,has become a pressing necessity, and the assistant cylinder hasbeen designed to meet this want. The system has been applied to 540,000 indicated horse-powerof various classes of engines, among which we may mention 24ships of the English Navy, and others of the Italian, Austrian,Dutch, Portuguese, Spanish. Argentine, Chilian and Japanesegovernments, besides many English mail steamers. AND RAILROAD JOURNAL. 379 The Pneumatic Tub
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
