This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1891 Excerpt: ...of the diagram in inches. This measurement may be made and computations computed on forty or fifty diagrams per hour by an expert computer using this instrument, obtaining the value of the mean effective pressure, inserting it in the formula already given, and computing the indicated horse-power. Mr. Lea has made an ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1891 Excerpt: ...of the diagram in inches. This measurement may be made and computations computed on forty or fifty diagrams per hour by an expert computer using this instrument, obtaining the value of the mean effective pressure, inserting it in the formula already given, and computing the indicated horse-power. Mr. Lea has made an interesting modificator of the ordinary indicator by the substitution of a planimeter for the pencilmotion, --either permanently or temporarily, as may be desired, --thus at once getting a measure and registry of the work done.f 68. Tachometers, Speed-indicators, Chronographs, and Counters are instruments of various kinds and classes used by the engineer in determining the speed of the engine, the second of the essential factors obtained by observation in measuring its power. Of these instruments, the counters and many speed-indicators give the exact and positive measures of the engine-speed required by the observer as data. They mechanically register the revolutions of the machine one by one, and give either the totals or the differences for selected intervals; or, more usually, they work continuously, and these totals or differences are read off at regular intervals by the observer and recorded in the log, thus giving the means of obtaining the average speed of engine throughout the trial. When indicator-diagrams are taken, the speed of rotation of the engine is taken as nearly simultaneously as possible. This measurement is commonly taken with one of the small hand speed-indicators, the spindle of which is applied to the centre in the end of the main shaft and there held a quarter or half minute, a full minute, or more, as less or greater accuracy is desired and as the speed of the engine is greater or less. Very exact measurement is usually de.
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Add this copy of A Handbook of Engine and Boiler Trials and of the to cart. $68.53, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2016 by Palala Press.
