The encyclopædia britannica; a dictionary of arts, sciences, literature and general information . e to smooth running and tothe reduction of the side-thrust which occurs when the air isadmitted on one side only. The fans are five in number: two are40 ft. in diameter by 12 ft. wide, and two 30 ft. in diameter by 10 , one of each size being erected at Liverpool and at Birken-head respectively. In addition, there is a high-speed fan 16 ft. indiameter in Liverpool which throws 300,000 cub. ft. The following table gi\xs the result of experiments made withthe ventilating fans of the Mersey ra
The encyclopædia britannica; a dictionary of arts, sciences, literature and general information . e to smooth running and tothe reduction of the side-thrust which occurs when the air isadmitted on one side only. The fans are five in number: two are40 ft. in diameter by 12 ft. wide, and two 30 ft. in diameter by 10 , one of each size being erected at Liverpool and at Birken-head respectively. In addition, there is a high-speed fan 16 ft. indiameter in Liverpool which throws 300,000 cub. ft. The following table gi\xs the result of experiments made withthe ventilating fans of the Mersey railway:— Hamilton Street, BirkenheadShore Road, BirkenheadJames Street, Liverpool .James Street, Liverpool .Bold Street, Liverpool , 1-302-502-452-30 1895328S24652062 Total ,880123,720300,000 The central point of the Severn tunnel (fig. 15) lies toward theMonmouthshire bank of the river, and ventilation is effected fromthat point by means of one fan placed on the surface at Sudbrooke,Monmouth, at the top of a shaft which is connected with a horizontal Gloucestershire. 7, \ miles »--—fatal Imgth of Tunnel 4 miles $24 gardi----?-** Fig. 15.—Section of Severn Tunnel (Fox),heading leading to the centre. This fan, which is 40 ft. in diameterby 12 ft. in width, removes from the tunnel some 400,000 cub. minute, and draws in an equivalent volume of fresh air from thetwo ends. About i8g6 an e-vcellent system was introduced by Signer Saccardo,the well-known Italian engineer, which to a great extent has minim-ized the difficulty of ventilating long tunnels under mountain-rangeswhere shafts are not available. This system, which is not applicableto tunnels in which underground stations , is illustrated infig. 16, which represents its application to the single-line tunnelthrough the Apennines at Pracchia. This tunnel is one of fifty-two single-line tunnels, with a gradient of i in 40, on the main linebetween Florence and Bologna, built by Thomas B
Size: 2917px × 857px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectencyclo, bookyear1910
