. Electric railway review . Pacific Electric Bridges—Overhead Crossing at Alhambra Avenue, Los Angeles. reinforced concrete has been employed almost exclusively as of 1:4:8 composition, the aggregate being taken from the a constructive material. The engineering problems involved excavated gravel as found, and varying in size from small in the design and construction of many ot these structures gravel to good-sized boulders. The foundations rest on a are of interest more especially because of the elemental and substratum of gravel, which at the deepest point was 18 feet. Pacific Electric Bridge
. Electric railway review . Pacific Electric Bridges—Overhead Crossing at Alhambra Avenue, Los Angeles. reinforced concrete has been employed almost exclusively as of 1:4:8 composition, the aggregate being taken from the a constructive material. The engineering problems involved excavated gravel as found, and varying in size from small in the design and construction of many ot these structures gravel to good-sized boulders. The foundations rest on a are of interest more especially because of the elemental and substratum of gravel, which at the deepest point was 18 feet. Pacific Electric Bridges—Typical Reinforced Concrete Culvert. natural drawbacks for which the constructing engineers had below the bed of the stream. It was impossible to handle the to provide. The unusually heavy rainfall during the rainy concrete with very extensive plants, and the mixing was done season and the varying character of foundation beds were with a No. 2 Ransome concrete mixer for the foundation l)rincipal among these difficulties. work and a No. 1 size for the arches and spandrels. The crossing of the San Gabriel river, a treacherous The composition used in the arches and spandrels above October 19, 1907. ELECTRIC RAILWAY REVIEW 675
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