A history of the growth of the steam-engine . h is in extensive use in the UnitedStates and Europe, has also been experimentally placed inservice on shipboard. Its heating-surface consists whoUyof tubes, which are connected by a peculiarly formedseries of caps; the joints are made tight with rubber grummets. Section II.—^Portable and Locomotive Engines. Engines and boilers, when of small size, are now oftencombined in one structure which may be readily transport-ed. Where they have a common base-plate simply, as inFig. 114, they are called, usually, semi-portable little engines h
A history of the growth of the steam-engine . h is in extensive use in the UnitedStates and Europe, has also been experimentally placed inservice on shipboard. Its heating-surface consists whoUyof tubes, which are connected by a peculiarly formedseries of caps; the joints are made tight with rubber grummets. Section II.—^Portable and Locomotive Engines. Engines and boilers, when of small size, are now oftencombined in one structure which may be readily transport-ed. Where they have a common base-plate simply, as inFig. 114, they are called, usually, semi-portable little engines have some decided advantages. Beingattached to one base, the combined engine and boiler is 348 THE STEAM-ENGINE OF TO-DAY. easily transported, occupies little space, and may veryreadily be mounted upon wheels, rendering it peculiarlywell adapted for agricultural purposes. The example here shown differs in its design from thoseusually seen in the market. The engine is not fastened toor upon the boiler, and is therefore not affected by expan-. Fw. 114.—Semi-Portatle Engine, 1S78. sion, nor are the bearings overheated by conduction or byascending heat from the boiler. The fly-wheel is at thebase, which arrangement secures steadiness at the highspeed which is a requisite for economy of fuel. The boil-ers are of the upright tubular style, with internal fire-bo2^ PORTABLE AND LOCOMOTIVE ENGINES. 349 and are intended to be worked at 150 pounds pressure perinch. They are fitted with a baffle-plate and circulating-pipe,to prevent priming, and also with a fusible plug, which willmelt and prevent the crown-sheet of the boiler burning, ifthe water gets low. Another illustration of this form of engine, as built insmall sizes, is seen below. The peculiarity of this engine
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Keywords: ., bookcentury1800, bookdecade1870, bookidc, booksubjectsteamengines
