. The Street railway journal . site was a somewhat uneven piece of ground which sloped abruptly from a point over which the loop is now located. Instead of filling in it was considered more economical tobuild a basement under the southernportion. This basement is now en-closed by retaining walls which inplaces are 12 ft. thick. The concreteused in the building consists of Giant Portland cementmixed in the proportions of 1, 2 and 4 with a good qualityof bank sand obtained near the work and with Potomac bluegneiss stone of- ^4 in- and gravel size. A cubical rotarymixer located near the
. The Street railway journal . site was a somewhat uneven piece of ground which sloped abruptly from a point over which the loop is now located. Instead of filling in it was considered more economical tobuild a basement under the southernportion. This basement is now en-closed by retaining walls which inplaces are 12 ft. thick. The concreteused in the building consists of Giant Portland cementmixed in the proportions of 1, 2 and 4 with a good qualityof bank sand obtained near the work and with Potomac bluegneiss stone of- ^4 in- and gravel size. A cubical rotarymixer located near the center of the building was the concrete was mixed it was distributed in wheel- square placed about 21 ft. 3 ins. between centers. Thecolumns rest on bases 6 ft. square and 16 ins. thick, andare reinforced with %-in. x i-in. rods. Those under thepit tracks are capped with 18-in. x 36-in. concrete beamsrunning at right angles to the tracks. The pit floors,which are 3^ ins. thick, rest directly on the 36-in. trans-. VIEW OF THE ROOF, SHOWING THE GREAT AMOUNT OF SKYLIGHT SURFACETHE LOCATION OF THE SKYLIGHTS AND
Size: 1947px × 1283px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
