Appleton's dictionary of machines, mechanics, engine-work, and engineering . ngles to the former. Bythe combination of these two motionswhen the instrument is in operation,a diagram is produced, which repre-sents the performance of the engineat all parts of its stroke. Action of the instrument. — Thecock C is inserted into the correspond-ing socket prepared for its reception,and the cord which passes under thepulley j is attached to the radius-baror other moving purt of the engine, soas to cause the cylinder E to makeone revolution on its axis, coincidentwith and representing the stroke of the
Appleton's dictionary of machines, mechanics, engine-work, and engineering . ngles to the former. Bythe combination of these two motionswhen the instrument is in operation,a diagram is produced, which repre-sents the performance of the engineat all parts of its stroke. Action of the instrument. — Thecock C is inserted into the correspond-ing socket prepared for its reception,and the cord which passes under thepulley j is attached to the radius-baror other moving purt of the engine, soas to cause the cylinder E to makeone revolution on its axis, coincidentwith and representing the stroke of the engine; on the relaxation of the cord at the termination of theup stroke, it is taken up again by the action of the spring in the upright of the cylinder V, and the cylin-der E resumes its original position. The slip of paper is then wrapped tightly round the cylinder, itsends being secured by the pressure of the two springs / /. These arrangements made, the pencil f isturned down into contact with the paper, and the engine allowed to make a stroke or two with the cock. 56 INDICATORS. C shut, so as to form an atmosphere line. A communication is then opened with the interior of the cyl-inder of the engine by turning the cock C, and a figure or diagram is traced upon the slip of paper, ex-acLy representing the successive pressures of the steam above, and corresponding degrees of exhaustionbelow the atmosphere line, at every part of the stroke. To find the mean effective values of each ofthese pressures respectively, the figure is to be divided, in the direction of its length, into any number
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Keywords: ., bookcentury1800, booksubjectmechanicalengineering, bookyear1861
