. Appleton's dictionary of machines, mechanics, engine-work, and engineering. re, the cir-cle S represents a slide-valve, different inform from the common slide-valve, inasmuchas it is circular instead of being semicircular;it has one upper and lower face in contactwith the ports of the cylinder A, and one ofeach in contact with the cylinder A. so thatas the valve is raised or depressed, the steamis admitted above or below both pistons attho same instant of time. 11 is the air-pump, the bucket of which is worked bythe beam K L moving round the centre I. Fig. 2731 is an outline elevation of the
. Appleton's dictionary of machines, mechanics, engine-work, and engineering. re, the cir-cle S represents a slide-valve, different inform from the common slide-valve, inasmuchas it is circular instead of being semicircular;it has one upper and lower face in contactwith the ports of the cylinder A, and one ofeach in contact with the cylinder A. so thatas the valve is raised or depressed, the steamis admitted above or below both pistons attho same instant of time. 11 is the air-pump, the bucket of which is worked bythe beam K L moving round the centre I. Fig. 2731 is an outline elevation of thedouble-cylinder engine. In tho oscillating wgints tho conneoting-rod is altogether dispensed with, the piston-rod being attached directly to the crank; andbecause the piston-rod from this mode ol at-tachment, most either be bent when motionensues, or the top of the cylinder must movelaterally, this is provided for bj allowing thocylinder itself to vibrate in a small are, ef-fected by casting trunnions on to the cylinder near its middle, as an axis upon which it 336 MARINE STEAM ENGINE. Fig. 2732 will give an idea of the appearance of the oscillating engine. Many nautical men, and some engineers, have objected to oscillating engines on account of the move-ment of the cylinder, which, they imagined, would become a formidable evil in the case of a vessel roll-ing heavily at sea. These objectors do not seem to have remarked that the rolling of the cylinder isneither dependent upon, nor proportionate to, the rolling of the ship, but is regulated exclusively by themovement of the piston; and it is difficult to see why a mass of matter, in the form of a cylinder,should be more formidable or intractable in its movements than a similar quantity of matter in theform of a side-lever, or in any other shape whatever It has also been objected against the oscillatingengine, that the eduction passages are more tortuous tnan in common engines, so that the steam getsout of the cylin
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Keywords: ., bookcentury1800, booksubjectmechanicalengineering, bookyear1861
