An elementary text-book on steam engines and boilers. For the use of students in schools and colleges by Kinealy John Henry 1864-

Author:Kinealy, John Henry, 1864-
Language: eng
Format: epub, pdf
Tags: Steam-engines, Steam-boilers
Publisher: New York, Spon & Chamberlain; [etc., etc.]
Published: 1901-03-25T05:00:00+00:00

their circumferences will be about 5 or 6 inches ; and, as the length of the card taken on an indicator must be considerably shorter than the circumference of the drum, the cards will usually be 3 inches long for a drum ij inches in diameter, and about 4 inches long for a drum 2 inches in diameter. The drum is connected to some point on the engine that, by a suitable " reducing motion," makes the drum move through a distance equal to the desired length of the indicator card. The motion of this point must be such that the drum of the indicator will make one complete movement in one direction, during the same time that the engine makes one stroke ; also, the ratio of the velocity of turning of the drum, at any instant, to the velocity of the piston, at the same instant, ought to be a constant quantity. If this last requirement is not fulfilled, the card will be distorted, shortened up at some places and lengthened out at others, so that an event which occurs at, say, one quarter of the stroke of the engine, will be shown on the card as occurring either before or after one quarter stroke. To test the accuracy of a reducing motion, put the engine on dead center, so that the piston'is just beginning its stroke, and mark the position of the pencil on the indicator card. Now divide the distance through which any chosen point on the cross-head moves, during one revolution, into a number, such as four or eight, of equal parts, and make a mark at each point of division. Move the piston forward until the chosen point on the cross-head coincides with the first division mark, and mark the position of the pencil on the drum ; then move the cross-head to the next division mark, and mark, again, the position of the pencil on the drum. Continue moving the cross-head forward one division, and marking the corresponding motion of the drum, until the piston has made one stroke. Take the card off the drum and determine whether or not the distance between any two successive marks is always the

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