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. 1912 Excerpt: ...to find the exact height of the riser, which is usually the first part of the stairs calculated, we assume that 14 risers will be necessary to make an easy ascent; therefore the height of each will be 105.625 14 = 7.54," or a little more than 1." This rise may be satisfactory for a flight of stairs which has to be ...
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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. 1912 Excerpt: ...to find the exact height of the riser, which is usually the first part of the stairs calculated, we assume that 14 risers will be necessary to make an easy ascent; therefore the height of each will be 105.625 14 = 7.54," or a little more than 1." This rise may be satisfactory for a flight of stairs which has to be crowded into a small space, or where economy of space is necessary, but as it is desirable that the height of a step should be less than that, we will allow 15 risers to be used; therefore, the height of each will be 105.625 15 = 7.04," which will make a much better rise. The height of the riser being found, the next thing is to find the width of the tread. If a straight run or a straight flight of stairs is being built, the horizontal distance between the starting and stopping points (a, of Fig. 54) may be divided into any number of treads; but if the flight has either a platform or winding treads, a plan should be sketched showing the location of the face of each riser, as in Fig. 55. A tread may be of any width sufficient to allow the foot to rest upon it safely, and the riser of any desired height not too high to reach easily by lifting the foot, but experience has shown that a certain range of proportions gives the best satisfaction. One method, as simple as any, of finding the width of the tread to fit a certain rise, is to subtract the sum of two risers from 24; the difference will equal the width of the tread. Thus, 24-(2 X 7.04) = 9.92, practically 10; the flight would be spoken of as a 7" X 10" flight. The width of the tread is between the riser lines, as at b, b; to find the exact width of the board which is to form the tread, it will be necessary to add to this the projection of the tread beyond the riser line ...
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