. American engineer and railroad journal . EGAN BAND SAW. of cDrapartments, and B B are hanging curtains, the space infront of which forms the working chambers tC. while be-hind these chamljcrs are chambers D, arranged alter-nately behind the former. The man in the lower workingchamber of each pair has always, when there is an inrush ofwater, an air space in front of the curtain B. A waj, Ji, is cutin the Boor of the safety chamber above him for him to climbup through, and a suitable doorway, E, is provided throughwhich the workmen can escape into the air-lock Z. This door-. A NEW TUNN
. American engineer and railroad journal . EGAN BAND SAW. of cDrapartments, and B B are hanging curtains, the space infront of which forms the working chambers tC. while be-hind these chamljcrs are chambers D, arranged alter-nately behind the former. The man in the lower workingchamber of each pair has always, when there is an inrush ofwater, an air space in front of the curtain B. A waj, Ji, is cutin the Boor of the safety chamber above him for him to climbup through, and a suitable doorway, E, is provided throughwhich the workmen can escape into the air-lock Z. This door-. A NEW TUNNELING SHIELD. The accompanying cut shows a form of tunneling shieldrecently patented in England by G. & W. D. Pearson, ofWestminster. These inventors aim at constructing tunnel-ing shields for use in tunneling through water-bearingstrata in such a manner as to provide for the men work-ing in safety in case of an inrush of water, to prevent thelining becoming displaced before or during the process of PEARSONS TUNNELING SHIELD. way is at a sufficiently low level to leave head-room and abreathing space of sufficient capacity to prevent his beingdrowned by the water, which latter will be kept back by avolume of air in the safety chamber, the pressure of whichwill equal that of the water. The front of each working cham-ber is made up with pollings or shutters II. These are of anyconvenient cross-section, carried by a suitable number of ramsK or screws, and are supported from behind in any convenientway. The adjacent edges are provided with suitable pack-ings W. n- are flexibl
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
