Compressed Air Work And Diving 1909
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66 COMPRESSED AIR WORK.
and the walls of one thickness. The 12-in. thick walls
extended to a height of 7 ft. above the ceiling, and above
that point were of 2-in. planking spiked to 12 by 12 in.
verticals. I hese caissons were built on two pontoons,
and when finished the pontoons were allowed to sink
by Alling with water until the caissons floatecl off. They
were then floated into position, and sunk by filling with
concrete in the usual way. Timber was also the material
used for the very large caissons employed in the con-
struction of the St Louis and Brooklyn bridges.