. Electric railway gazette . thespacing 3 feet. The section under the Common is a four-track passage, and therefore has a double span 48 feetwide with a line of supporting columns down the side columns are 15-inch I-beams with a rivetedplate foot, and the middle columns are built up of angleiron and plates. Each column rests upon a solid founda 412 ELECTRIC RAILWAY GAZETTE. Vol. XIII. No. 23. tion stone bedded in concrete. Fig. i gives a general viewof the iron work. When the iron construction work iscompleted, wooden formers are placed between the I-beams to facilitate the construc
. Electric railway gazette . thespacing 3 feet. The section under the Common is a four-track passage, and therefore has a double span 48 feetwide with a line of supporting columns down the side columns are 15-inch I-beams with a rivetedplate foot, and the middle columns are built up of angleiron and plates. Each column rests upon a solid founda 412 ELECTRIC RAILWAY GAZETTE. Vol. XIII. No. 23. tion stone bedded in concrete. Fig. i gives a general viewof the iron work. When the iron construction work iscompleted, wooden formers are placed between the I-beams to facilitate the construction of the brick arches, asshown in Fig. 2, and when these are well formed theremaining space is filled up with concrete and leveled walls between the side columns are also arched toresist lateral pressure. Concrete only is used in the sidearches, except for the portions under Charles Street andthe Public Gardens, where the ground was found to be of Where Does the Relation of Passenger and CarrierCommence and End ?. FIG. 4—MINIATURE ELEVATED TRACK. a damp, clayey nature; in these places it was deemedadvisable to use tiles in forming the vertical arches. Over35,000 tons of steel has been used in the construction ofthe subway sections above mentioned; the steel is boltedtogether and hot-riveted in accordance with the practiceof bridge constructors. Fig. 3 gives a view of the interior of the subway. Around vitrified drain trench is provided which is connectedat intervals to a 20-inch sewer three feet below which car-ries off the water. Before filling and grading over a com-plete section, the mass of concrete and iron work is given
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1895
