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. 1164699679 1851, cloth boards with rubbing through at corners, clean-no stains or soiling, has a good binding, notations of authors death in pencil on front blank page dated 1883-name and date written on title page-title written on spine with whiteout-no marks or notations on text.
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