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. 1851 Excerpt: ...In this similar letters of reference indicate similar parts, with only these differences in the arrangement, that the water is received at ...
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. 1851 Excerpt: ...In this similar letters of reference indicate similar parts, with only these differences in the arrangement, that the water is received at one large aperture in the centre of the vanes, the line of direction of the discharge being a tangent to the circle. The dotted lines at Gr denote a tube leading from the bottom of the vessel, through which the water ascends into the paddle-box; and it may be supposed that similar tubes are employed in the first described plan, for conducting the water into the paddle-box. The centrifugal force of the paddles acting on the water within the box, produces a pressure all round the interior of the box, which gives a tendency to move in a direction opposite to the side where the opening is made in the circumference; while the same causes accelerate the entrance of the water into the box, which is produced in the first instance by the paddle-box being placed within the vessel, and lower than the exterior water. FLAP PROPELLER. Fio. 32. Fig. 32 represents a plan of folding paddles, D, placed on both sides of the vessel. The paddles are attached to hinged joints, A, and to the prolonged axis, C, of the traversing frame. They fold, and present only their sharp edges to the water when moving forward from stern to stem, and they open and act with a large surface on the water when moving backwards. The traversing frames are kept to the sides of the vessel by grooved guides, G, H. II are friction rollers at the ends, and at the middle, to keep them steady, and to assist them in moving. The upper part of the frame consists of a rack, which is acted upon by the toothed wheel, the axis of which passes through the vessel and terminates in similar wheels on the other side, to act upon similar racks. To the piston rod of the steam engine, ...
Fair in None Issued jacket. Size: 12mo-over 6¾"-7¾" tall. Scarce title. Blue gilt stamped cloth over boards, gilt illustration of a steamboat on front cover and blind stamped steamboat on back cover, 144 pages, illustrated with a frontis and 82 figures in the text. "The object of this History of Propellers and Steam Navigation is two-fold. One is the arrangement and description of many devices which have been invented to propel vessels in order to prevent many ingenious men from wasting their time, talents, and money, on such projects. It is not pretended that it contains all the propelling devices which have been invented, but it contains the only instructive arrangement, and by far the greatest variety of such devices; and in this respect it is hoped that it will be the means of doing some good. Another object of this work is, to present an interesting history of Steam Navigation especially that of the attempts of the early inventors in this department of practical mechanics. There has been much controversy respecting the claims of those men who made the first experiments in steam navigation. The authors examine the claims of each, and has treated the subject, he believes, and impartially. Much information, to be found in no other work, is arranged within, relating to Fitch, Rumsey, Fulton, Symington, and Bell." Includes chapters on River steamboats, screw propellers, and ocean navigation & the marine steam engine. Spine and covers are faded, corners and spine ends bumped with some wear, small paper label on spine, front end papers have previous owner's name and address in pencil as well as extensive doodling, end papers lightly foxed, scattered very light foxing in the text; otherwise the interior is clean with no writing or marks, and the binding is sound. Quantity Available: 1. Category: Science & Technology; Ships & the Sea. Inventory No: 006633.
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