Compressed Air Work And Diving 1909
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5 8
COMPRESSED AIR JEORÄ'.
with two clear opening spåns of 52 ft. The roller path
is supported on four 8-ft. diameter cylinders, described
above, spacecl 18 ft. 6|- in. centres, and as it was
necessary that there should be no settlement under the
Fig. 8.—Sinking Barmouth Cylinders.
roller path it was deciclecl to carry the cylinders to a
solid rock bottom. This was reachecl at the clepth of
95 ft. below water, equivalent to a pressure of 41 Ibs. per
sq. in. above that of the atmosphere, but owing to a