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. 1921 Excerpt: ...The type of stair construction is determined by the design of the face string. A "closed" string completely covers and hides the ends of the treads and risers, while an "open" string is below the treads and risers, thus allowing them to project over, and to show a finish on the ends. Ordinary Construction: Closed ...
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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. 1921 Excerpt: ...The type of stair construction is determined by the design of the face string. A "closed" string completely covers and hides the ends of the treads and risers, while an "open" string is below the treads and risers, thus allowing them to project over, and to show a finish on the ends. Ordinary Construction: Closed Strings.--The cheapest and simplest form of closed face string consists of a steel plate, to the inside of which are riveted light angles or cast step brackets usually about 1J inches by 1J inches, thus forming lips or flanges to receive the treads and risers. For ordinary rise and tread a plate ten to twelve inches wide will suffice to project slightly above the nosing lines of treads and to extend far enough below the bottoms of risers to allow the attachment of the shelf angles. For light traffic and not excessive spans this width of string will usually give sufficient strength, provided the thickness is not reduced beyond good practice. Plates of a thickness less than one-fourth inch should navcr be used. Plate-iron strings are not suitable for heavy loads or long spans, as they possess little lateral strength. Ornameiitation may be secured by applying cast-iron rosettes to the string face at intervals, or by running cast-or drawn-mouldings along the edges, or by planting mouldings on the face of string so as to form a panel, as shown in Fig. 166. If required, lateral stiffness and increased capacity may be secured by riveting top and bottom angles to the outside of the stringer plates, thus forming a channel section, or as is still cheaper and better, a channel-iron may be used for the string. A channel-iron string may be ornamented by means of applied cast-iron rosettes or other ornaments, but a still more finished appeara...
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Add this copy of Fire Prevention and Fire Protection as Applied to to cart. $750.00, good condition, Sold by Princeton Antiques Bookservice rated 4.0 out of 5 stars, ships from Atlantic City, NJ, UNITED STATES, published 1921 by JOHN WILEY & SONS, INC.