Scientific American Supplement, No. 623, December 10, 1887 by Various
page 66 of 143 (46%)
page 66 of 143 (46%)
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Upon a wide concrete foundation a pedestal was built, in which were united the various smoke conduits, and upon this pedestal were erected four lattice girders, C, connected with each other by St. Andrew's crosses. The internal surface of these girders is vertical and the external is inclined. Within the framework there was built a five-inch thick masonry wall of bricks, made especially for the purpose. The masonry was then strengthened and its contact with the girders assured by numerous hoops, especially at the lower part; some of them internal, others external, to the surface of the girders, and others of angle irons, all in four parts. [Illustration: FIG. 2--HORIZONTAL SECTION.] The anchors rest upon a cast iron foundation plate connected, through strong bolts embedded in the pedestal, with a second plate resting upon the concrete. As the metallic framework was calculated for resisting the wind, the brick lining does not rest against it permanently above. The weight of the chimney is 1,112,200 pounds, and the foundation is about 515 square feet in area; and, consequently, the pressure upon the ground is about 900 pounds to the square inch. The cost was $3,840. [Illustration: FIG. 3--VERTICAL SECTION OF THE CHIMNEY.] The chimney was built six years ago, and has withstood the most violent hurricanes. The mounting of the iron framework was effected by means of a motor |
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