File:A new family encyclopedia, or, Compendium of universal knowledge - comprehending a plain and practical view of those subjects most interesting to persons, in the ordinary professions of life - (14588652178).jpg

Identifier: newfamilyencyclo00good (find matches)
Title: A new family encyclopedia, or, Compendium of universal knowledge : comprehending a plain and practical view of those subjects most interesting to persons, in the ordinary professions of life : illustrated by numerous engravings
Year: 1831 (1830s)
Authors: Goodrich, Charles A. (Charles Augustus), 1790-1862
Subjects: Encyclopedias and dictionaries
Publisher: Philadelphia : (s.n.)
Contributing Library: Sterling and Francine Clark Art Institute Library
Digitizing Sponsor: Federally funded with LSTA funds through the Massachusetts Board of Library Commissioners

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gives mo-tion by its levers, to the valve I. I, a coffer-slide valve, which requires no packing to make it steam-tight, as there is always a vacuum under it: it answers the purpose ofthe four valves used in double-power engines, and from the simplicityof its construction, when well made at first, is not liable to get out oforder. K, the steam-admission valve and lever, connected with a governor,which regulates the speed of the engine. L, the cylinder of the discharging pump, for extracting the waterand uncondensed vapor from the condenser M. N, a small cistern, filled with water. Into this cistern enters a pipethe condenser M, the top of which pipe is covered with a valve, jich is called the blow-valve, sometimes the shifting valve. Through lis valve the air contained in the cylinder D, and passages from it, isdischarged, previously to the engine being set in motion. O, the eduction pipe, which conducts the steam from the valve I tothe condenser M. FACYCLOPEDIA. 183 ST E A 31 ENGINE.
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184 FAMILY AIDS TO LOCOMOTION. P, the pump which supplies with water the cistern SS, in which thecondenser and discharging pump stand. QQ, iron columns, of which the engine has four, although only twoare shown ; they stand upon one entire plate seen edgeway, on whichthe principal parts of the engine are fixed ; by this means the beamand its accompaniments are supported without being connected withany part of the building, except the recess below the floor on which theystand. RR, the recess below the floor, for containing the cistern of the dis-charging pump, condenser, &c. This arrangement enables those en-gines to be fixed up and tried at the manufactory before they are sentoff, which renders the refixing easy and certain. Before the engine is set to work, the cylinder D, the condenser M,and the passages between them, are filled with common air, which it isnecessary to extract. Te effect this, by opening the valves, a commu-nication is made between the steam-pipe C, the space bel

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