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It may seem lost effort to tell the workman that one of the first requisites, and the most important one, is that the carriage of a flight of stairs be built strongly and with timbers of such a dimension that any ordinary weight that may possibly be taken over the stairs will not cause the timbers or strings to "sag" or bend under the load. Often pianos are taken upstairs, and these may have a weight of anywhere from 350 to 1,000 pounds, or more, and this stair, with the weight of four or five men added who will be required to assist in getting one of these bulky instruments upstairs, will increase the weight considerably. The framework of a stairway should be made to resist a stress of not less than two tons. Strings for flights having ten or less treads, should never be less than 14 in. wide and 1l/2 in. thick, and these should be re-enforced by rough-cut strings 10 or 12 in. wide and 2 in. thick. One of these rough strings should be spiked or screwed to the inside of the open string, and another similarly fast≠ened to the wall or housed string, and one or two of these strings should be placed at equal distances between the open and wall strings. The rough strings should fit accurately against both tread and riser in order to get the best results. Flights of greater length should have stouter strings and more bearing pieces. If the outside string is supported with a partition run≠ning to the floor, or the stairs have a cross partition,

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