Compressed Air Work And Diving 1909
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6 COMRRESSED AIR WORK
should be added together, and the proper stoppages for
such an exposure used during the second ascent.
With an interval of one hour between the exposures
these precautions may be halved, or with two hours
interval may be altogether omitted, if the duration of
exposure during the first dive has not exceeded that
shown in the table.
Table II.—This table is for use when a diver has
been detainecl at the bottom beyond the ordinary limit
of time by reason of some Occidental circumstance, such
as getting his life line or air pipe entangled.
These two tables for diving have been so arrangecl,
by a slight modification in the spacing of the stoppages
demanded by theoretical considerations, as to prevent
any danger of “bends” in the water. It should be
noted that “ bends,” which are caused by the more slowly
desaturating tissues, although painful, are not so clanger-
ous as other symptoms, such as paralysis. hor this
reason, if the diver is in a collapsecl condition after a
long exposure in colcl water, the last stop at 10 ft. might
be omitted, since the stoppage at 20 ft. will already have
got rid of most of the harmful excess of gas. If de-
compression symptoms are feared, and no medical lock
is available, the diver should be kept on the laclder for
about ten minutes, so that he can be lowerecl into the
water if necessary. And when he has been brought on
board he might sit for another twenty minutes before
undressing, still wearing his boots, helmet, &c., and
merely having his front and back lead weights removecl,
so that he can be sent below again at once on the appear-
ance of symptoms.
It will not usually be necessary for him to go to a
greater clepth than that for the first stoppage, and
generally a clepth of 20 ft. will be sufficient.