Compressed Air Work And Diving 1909
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4S
COMPRESSEZ) AIR WORK.
or Icft open in the form of brackets. If the former
methocl is adopted, the cutting edge will be considerably
strengthenecl, both by the plating connecting the brackets
together and also by the concrete Alling inside. If the
Fig. 3.—Cross Section of Pneumatic Caisson.
latter, there will be more head room for the workers and
enable them better to get close up to the cutting edge
and to work under and behincl it. The timber framino-
o
starts immediately above the ceiling and is knocked out