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. 1885 Excerpt: ...back lash which results. Wheel-gearing for driving the valves was at one time very favourably received, especially by French engineers, who had one or two plans which were said to give exceedingly good results, but its use has now almost died out; and although a second shaft with wheel-gearing was adopted by the ...
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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. 1885 Excerpt: ...back lash which results. Wheel-gearing for driving the valves was at one time very favourably received, especially by French engineers, who had one or two plans which were said to give exceedingly good results, but its use has now almost died out; and although a second shaft with wheel-gearing was adopted by the designers of the engines of the SS. "City of Rome " for a particular purpose, it is not likely ever to revive again, at least not in the mercantile marine. Expansion Valves.--When ordinary link motion is employed, and an earlier cut-off than half-stroke is required as a normal condition, it is necessary to effect it by means of an independent valve, usually called the expansion valve. These valves are usually common plates, sliding either on a face with ports on the side of the valve-box, or on a face on the back of the ordinary slide-valve. In the latter case there are two methods, commonly known as tlie inside cut-off and ilie outside cut-off. Gridiron Expansion Valves.--When the valve works on an independent face on the side of the valve-box, it consists of a plain plate with steam ports in it, corresponding to the steam ports on the face; there is sufficient lap, and the gear is so set that it remains closed after it has cut-off, until after the main valve is closed to the cylinder, when it may open again so as to fill the valve-box, and be ready to supply and cut off steam from the other end of the cylinder. The variation in cut-off is effected by varying the travel, and the equalisation of cut-off at each end is effected by varying the proportion of lap on each side of the ports. The variation in travel is obtained by means of a link on which the block to which the expansion eccentric-rod is attached slides, so as to vary the length ...
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Add this copy of A Manual of Marine Engineering to cart. $63.85, very good condition, Sold by Bookcase rated 4.0 out of 5 stars, ships from Carlisle, UNITED KINGDOM, published 1904 by Charles Griffin and Company.
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Seller's Description:
Very Good. No Jacket. 8vo Thick. Modern, tidy re-bind. Ink inscrip to fly title, some staining to top and base closed edges, pages tanned, else clean and solid.
Add this copy of A Manual of Marine Engineering to cart. $74.46, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2010 by Nabu Press.
