Compressed Air Work And Diving 1909
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56
COMPRESSED AIR WORK.
opening outwards, through which the excavated material
was removed. The hoppers were fittecl with valves to
allow the air pressure to bc raised and lowerecl in the
Fig. 6.—Conway Bridge Cylinders.
same way as in the entrance chamber for men. During
the sinking these cylinders were guided by four rolied
Steel joist piles, braced horizontally by channel bars
and diagonally by angles. Screws were usecl for lower-