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قراءة كتاب Scientific American Supplement, No. 484, April 11, 1885
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Scientific American Supplement, No. 484, April 11, 1885
SCIENTIFIC AMERICAN SUPPLEMENT NO. 484
NEW YORK, APRIL 11, 1885
Scientific American Supplement. Vol. XIX, No. 484.
Scientific American established 1845
Scientific American Supplement, $5 a year.
Scientific American and Supplement, $7 a year.
BLAAUW KRANTZ VIADUCT IN CAPE COLONY.
This viaduct is built over a rocky ravine on the railway from Port Alfred to Grahamstown, at a height of about 200 ft. from the bottom. Its length is 480 ft. 6 in., and the width of the platform is 15 ft., the gauge of the railway being 3 ft. 6 in. The central span of the viaduct is an arch of 220 ft. span between abutments, and about 90 ft. height; the remainder of the space on each side is divided into two spans by an iron pier at a distance of 68 ft. from the retaining wall. These piers are 36 ft. 2 in. high, and carry girders 144 ft. long, balanced each on a pivot in the center. One end of these girders is secured to the retaining walls by means of horizontal and vertical anchorages, while the other end rests in a sliding bearing on the top flange of the arch.
BRIDGE OVER THE BLAAUW KRANTZ RAVINE, CAPE COLONY.
