Elements of Practical Construction Volume . 1; For the Use of Students in Engineering and Architecture. Structures in Direct Tension and Compression - Softcover

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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. 1875 Excerpt: ...fig. 76 to 78: the vertical square pillar between the flanges is 9 inches on the side, and has cast upon it a quadrant pipe, opening upwards, intended to receive the rain from the roof, 6 inches in internal diameter, with a socket at the end in order to admit a vertical pipe, which is cast with a double bend, to enuble it to be led past the longitudinal girders attached, and brought nearly centrally underneath a box, open at top, and about 4 inches deep, placed immediately below the level of the valley of the roof; the rain is made to flow towards this point by giving the valley the usual fall of about 1 inch in 10 feet from the middle point between the successive pairs of columns; thus each of the hollow pillars has a well-defined and equal portion of the roof area to drain. The box above mentioned is lined with sheet lead in continuation with that of the valley. The angle irons of the bottom flanges of the upper wrought iron girders, supporting the roof, which are of the lattice form of construction, are bolted down on the bottom flange of the connecting piece by inch screw bolts. The top flange of the girder is given all the advantages of a fixed and continuous beam by a very ingenious arrangement: the total depth of the girder, being 2 ft. iinch, gives it a height of 8% inches above the extreme top of the column C; and a casting in two pieces (somewhat similar to the cast iron chairs which hold in place some of the forms of rails now in use on railways) embraces the top flange of the girder on each side, and the three are united together by an inch screw bolt passing transversely through all, as shown in figs. 76, 77. A suitable form is given to the inner surface of the castings, adapting them to fit the angle irons and rivet heads of the upper flange o...

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