Science and Industry Volume 4

Science and Industry Volume 4

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1899 edition. Excerpt: ...the throw of eccentrics or reversing the engine entirely. The aim of the inventor seems to have been merely to secure a reversing motion, and not expansive working. An improved form of this motion was used on one of the English roads i tbe North Stafford Railway) from 1871 to 1880. In this there was only one eccentric for the t wo gears; there were, of course, two eccentric rods, one for eaei valve, but they were driven off the same eccentne strap, the left connection being made by means of a bell-crank lever. While this motion was all right theoretically, yet the wedges often stuck and made it difficult or impossible for the engineer to handlr his engine. This finally incurred government censure, and lead to its abandonment. Joy's latest valve gear is evidently a development of the one under consideration. It has but very few part? thereby saving weight, first cost, and upkeep, it does not require reverse lever, reach rod. reverse shaft, links, hangers, or rockers: there is nothing but one eccentric and rod 3 for each valve, the eccentric rod coupling direct to the valve stem guide--a double-eye connection, of course The reversing is don by fluid pressure. This gear also gives a very fine steam distribution, it has not been used in this country yet; in fact, we have only seen it applied to single engines, so Ear It could not readily be adapted to coupled engines. (166) How can I repair a hard-rubber developing tray, the side of which is cracked for about 4 inches Can I put on a patch of the same material, and how: G. D. R., Glenville. Ohio. Ans.--Clean the inside of the cracked surface with benzine and turpentine, and cement a piece of soft rubber (such as elastic bands are made of) over the crack. For cement use the preparation with whicl...show more

Product details

  • Paperback | 450 pages
  • 189 x 246 x 23mm | 798g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236509862
  • 9781236509864