The steam-engine indicator and its use. A guide to practical working engineers for greater economy and the better working of steam-engines by Le Van William Barnet 1829-

Author:Le Van, William Barnet, 1829-
Language: eng
Format: epub, pdf
Tags: Indicators for steam-engines
Publisher: New York, D. Van Nostrand
Published: 1884-03-25T05:00:00+00:00

accurate measurements have been made by the indicator ; but the average area of indicator cylinders is only about one-half of a square inch, while that of cylinders indicated may vary from ten square inches to as many square feet. By the use of the indicator, the determination between nominal (calculated), indicated (real), and effective horse-power is found, — the variations between which are very marked.

The indicator also furnishes one of the data for ascertaining the power exerted by the steam-engine; namely, the mean or average pressure of the steam during the stroke on each square inch of the piston. Stated more accurately, it shows the excess of pressure on the steam side of the piston to produce motion, over that on the exhaust side to resist it; and from no other source can it be so accurately ascertained.

The pressure in the boiler is readily known ; but the steam in its passage to the cylinder is subject to various losses, such as wire-drawing, condensation, friction, etc., so that frequently the pressure on the piston does not exceed two-thirds of that on the boiler.

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