. Electric railway journal . Cross Section Fond du Lac Avenue Carhouse—Cross-Section of Main Building viding a 23-ft. clearance under the bottom chord of the rooftruss. The columns which support this roof truss, as wellas the ends of the I-beams on the adjoining bays, were de-signed with the object of carrying a runway for a 20-tonbridge crane. The roof proper is a 2%-in. concrete slab reinforcedwith bars and covered with a four-ply composite asbestossheathed roofing. In providing drainage to the down- Fence skylights of the same design also furnish individual illumi-nation to portions of the
. Electric railway journal . Cross Section Fond du Lac Avenue Carhouse—Cross-Section of Main Building viding a 23-ft. clearance under the bottom chord of the rooftruss. The columns which support this roof truss, as wellas the ends of the I-beams on the adjoining bays, were de-signed with the object of carrying a runway for a 20-tonbridge crane. The roof proper is a 2%-in. concrete slab reinforcedwith bars and covered with a four-ply composite asbestossheathed roofing. In providing drainage to the down- Fence skylights of the same design also furnish individual illumi-nation to portions of the shop in the north panel of therepair bay. The skylights over the central panel or crane runwaysection of the repair bay are flush with the roof surface,the glass area replacing the reinforced concrete slab. Ninesections of this glass roof, having approximate dimensionsof 16 ft. x 32 ft., are spaced at 40-ft. intervals. Each glass. Fond du Lac Avenue Carhouse—Central Arrangement of Tracks and Buildings spouts which lead to the carhouse sewer by way of thebuilding columns no change was made in the supportingstructure, but enough cinder concrete was applied on topof the concrete roof slab to give a gentle slope to eachdown-spout. Concrete curbs built in conjunction with theroof slab bound the numerous skylight openings, which arethe only source of natural illumination. The skylight area is provided with a 30-in. ventilator and the whole issupported on a pressed-steel frame. Sixteen rolling steel doors of the interlocking slat de-sign are installed at the car entrances. These doors are intwo sizes, eight of them being 12 ft. x 15 ft. and eight17 ft. x 15 ft. All are manually operated by way of chainhoists and locks beside the entrance. At each opening in March 15, 1913.] ELECTRIC RAILWAY JOURNAL 499 the longitudinal walls of the building is an Underwritersautomatic fire door. PIT DESIGN DETAILS Pits are provided
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