Canal Navigation: On the Resistance of Water to the Passage of Boats Upon Canals and Other Bodies of Water, Being the Result of Experiments

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Roake and Varty, 1833 - Canal-boats - 55 pages
 

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Page 4 - The result has disproved every previous theory as to difficulty and expense of attaining great velocity on canals ; and as to the danger or damage to the banks of canals by great velocity in moving vessels along them...
Page 16 - ... size with the largest part of this inclined plane, so that when the piston is at the upper end of the cylinder, the notch is completely filled up by the inclined plane; on the contrary, when the piston is at the lower end of the cylinder, the notch is open : by this contrivance the aperture through which the fluid is obliged to pass, as the piston moves from the lower end of the cylinder to the higher, is gradually contracted, and, of course, the resistance of the piston through the fluid gradually...
Page 16 - ... plane, is soldered to the inside of the cylinder, parallel to its axis, the largest part being at that end of the cylinder towards which the piston rises when the index moves towards the greater power. The notch, which was before mentioned as cut in the side of the piston, exactly corresponds in size with the largest part of this inclined plane, so that when the piston is at the upper end of the cylinder, the notch is completely filled up by the inclined plane; on the contrary, when the piston...
Page 2 - The real superiority of the skielobere, however, is chiefly shown when the enemy halts after a long march. Whatever precautions may then be taken, they are in constant danger from troops which have no occasion for path or road, and traverse with indifference marshes, lakes, rivers, and mountains ; even in those parts where the ice is too feeble to bear the weight of a man, the skielobere glides safely over by the mere rapidity of his motion.
Page 16 - ... therefore, will not pass through equal spaces in the cylinder, and the vibrations would consequently be greater in the higher numbers, because, the velocity of the piston being less, its resistance through the fluid will be less, at the same time the power opposed to it is greater. To obviate this, and make the index equally steady on all parts of the dial, a narrow slip of brass, formed into an inclined plane, is soldered to the inside of the cylinder, parallel to its axis, the largest part...
Page 15 - ... spaces when equal forces are applied in different states of tension of the spring; the piston, therefore, will not pass through equal spaces in the cylinder, and the vibrations would consequently be greater in the higher numbers, because, the velocity of the piston being less, its resistance through the fluid will be less, at the same time the power opposed to it is greater. To obviate this, and make the index equally steady on all parts of the dial, a narrow slip of brass, formed into an inclined...
Page 4 - The entire cost of a boat and (ittings up is about £125. The hulls are formed of light iron plates and ribs, and the covering is of wood and light oiled cloth. They are more airy, light and comfortable than any coach ; they permit the passengers to move about from the outer to the inner cabin, and the fares per mile are one penny in the first, and three farthings in the second cabin. The passengers are all carried under cover, having the privilege also of an uncovered space. These boats are drawn...
Page 4 - ... miles daily, including interest on the capital, and twenty per cent, laid aside annually for replacement of the boats, or loss on the capital therein invested, and a considerable sum laid aside for accidents and replacement of the horses, is...
Page 43 - ... manager of the school to such expulsion be obtained beforehand. 71. The instrument to be used in the infliction of corporal punishment for serious offences against the discipline of the school, or for other grave offence, must be a leather strap, not exceeding twenty inches in length, and not over one inch and a half in breadth, and a quarter of an inch in thickness. ROUTINE. 72. All Primary Schools must be classified in accordance with the standards of Schedule F, and the proficiency of the...
Page 2 - There > are many cases in navigation where a sharp cut-water shape to a boat would be as unphilosophical as a knife-edged felloe would be to a wheel intended for ploughed land. A cart wheel will, on gravel or other yielding matter,sink to the determined line of gravitation with as much certainty as will a boat on water ; and a boat resting in water will (according to the velocity given to it, and the . form of its prow and bottom,) rise nearer the surface of the water, as well as a cart wheel will...

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