OCR Text |
Show THE AND LO-FPE N CH CHANNEL CHAN-NEL TUNNEL. This tunnel, tho London Lancet remarks, if it becomes an accomplished accom-plished lact, will tot very severely the abilities of our "ventilating" architects and engineers. The Engineer En-gineer has elaborated some curious statistics on the subject, and arrives at the conclusion that, having regard to the number of trains sent through daily, it will be necessary, if ordinary locomotives are used, to renew the air iu the tunnel entirely every hour, and,! as the tunnel will be twenty miles long, and all the air must be withdrawn with-drawn lrom one end of the tunnel to the othes, a current of air must be passed through at the rate of twenty miles an hour. These results are, of course, arrived at ou the supposition that the air would be rendered irres-pirable irres-pirable by the coke smoke evolved, and the obvious alternative is to apply ap-ply motive power by means other than those iu use ou ordinary railways. It has, too. yet lo be decided by the engineering world whether uie erection oi a stiait or siiarts in tho channel is practicable. In consider ing thii important subject ot ventilation ventila-tion in connection with the channel tunnel, we have no work in ex slence at ail analogous to the propositi struct-u struct-u re; lor that IhroughMouiCeui- is comparatively com-paratively short, admirably situated for purposes of ventilation, and n.e Metropolitan railway is mj riddled with opens, shafts, and holes iu every direction that even London smoke aud dirt fail to make its atmosphere more than dense, or in some parts disagreeable. |