File:A manual of elementary geometrical drawing, involving three dimensions. Designed for use in high schools, academies, engineering schools, etc. - and for the self-instruction of inventors,artizans, (14762646881).jpg

Identifier: manualofelementa01warr (find matches)
Title: A manual of elementary geometrical drawing, involving three dimensions. Designed for use in high schools, academies, engineering schools, etc. : and for the self-instruction of inventors,artizans, etc. ... In five divisions ..
Year: 1867 (1860s)
Authors: Warren, S. Edward (Samuel Edward), 1831-1909
Subjects: Geometrical drawing Mechanical drawing
Publisher: New York : J. Wiley and son
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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or the elevation. A line through themiddle point, r, of m?^, is another centre line for the i^lan of thebottom of the step. Having chosen a scale, the position of thecentre lines, and the arrangement of the figures, the details of theconstruction may be left to the student. 152. Ex. 6. A metallic steam tight Packing-, for thestuffing boxes of piston rods. PI. VII., Fig. 77. Mechanical Construction.—Attached to that end, J, of Fig. 77 («),of a steam cylinder, for instance, at Avhich the piston rod, p, entersit, is a cylindrical projection or neck, w, having at its outer enda flange, ff, through which two or more bolts pass. At its innerend, at p, this neck fits the piston rod quite close for a short space.The internal diameter of the remaining portion of the neck is suffi-cient to receive a ring, rr, which fits the piston rod, and has on itsouter edge a flange, t, by which it is fastened to the flange, ff, on-the neck of the cylinder by screw bolts. The remaining hollow DiY n. PL.V.
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n CONSTRUCTIONS IN METAL. 57 space, s, between the ring or gland, ?r, and the inner end of theneck, is usually filled with some elastic substance, as picked hemp,which, as held in place by the gland, fr, makes a steam tight joint;which, altogether, is called the stuffing box. 153, The objection to this kind of packing is, that it requires sofrequent renewals, that much time is consumed, for instance in rail-road repair shops, in the preparation and adjustment of the packing.To obviate this loss of time, and perhaps because it seems moreneat and trim to have all parts of an engine metallic, this metallicpacking. Fig, 77, was invented. ABC—AB is a cast iron ring,cylindrical on the outside, and having inlaid, in its ciicumference,bands, tt\ of soft metal, so that it may be squeezed perfectly tightinto the neck of the cylinder. The inner surface of this ring is coni-cal, and contains the packing of block tin. This packing, as a whole,is also a ring, whose exterior is conical, and fits t

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