A Practical Treatise on the Construction of Horizontal and Vertical Water-wheels ...: Specially Designed for the Use of Operative Mechanics

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E. & F.N. Spon, 1871 - Hydraulic engineering - 63 pages
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Page 39 - ... the root of the given number. Required the cube root of 412568555. By the table, the nearest number is 411830784, and its cube root is 744. Therefore, 411830784 x 2 + 412568555 = 1236230123. And, 412568555 x 2 + 411830784 = 1236967894. Hence, as 1236230123 : 1236967894 : : 744 : 744-369, very nearly. To find the square or cube root of a number containing decimals. RULE. — Subtract the square root or cube root of the integer of the given number from the root of the next higher number, and multiply...
Page 26 - ... fitted another circumference of cast-iron, 1 ft. 2 in. across. These circumferences are thus fastened together by means of the curves which are bolted into each, and a compact wheel thus formed, weighing in all about 45 cwt., and having 32 curved openings for venting the water through. The pipe serves the double purpose of keeping the shaft from the water, and of sustaining in its place the centre disc. It is furnished with a square collar, with four paws, by which it is suspended from the four...
Page 38 - ... foot and the top surface of the disc next it, some of the discs will revolve, but the continuous system of lubrication will in a few minutes cause the foot to glide over its former resistance and again revolve on the surface of the disc next to it. By reference to Fig. 3, it will be seen that this shaft does not run upon a step at the bottom, but upon discs having openings in the centre of each to let the shaft pass through them. This diagram is for a turbine shaft of 60-horse power, on a fall...
Page 41 - Measure some convenient distance along the stream, say 100 feet; at the extremities of this length, and at right angles across the stream, fix two straight cords ; then get a few floats of...

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