Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
team 15 lbs.to the square inch. This, however, is accom-plished by the condensing or low-pressure en-gine (Fig. 43). The advantage of the atmospheric pressureon a piston of iioo feet diameter is nearly three(did a half tons. 85S. Figure 42. — Stuffing-boxes.— The object of these is to furnish a… … 1!)8 HEAT AND STEAM-ENGINE. Let II be a section of the piston-head, with a hollow, dish-like pro-jection, L, on its ujiper surface, filled with cotton, hem}), or other tibroussubstance, sliovvn by the small dots; over which is placed a downwardprojecting disk or collar, which crowds upon the…
Physics · Astronomy
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