Compressed Air Work And Diving 1909
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STAGE DECOMPRESSION. 3
direction of the Aclmiralty Committee, and has been
adopted for use in the British Navy.
Note. — I hroughout this book pressures are +, or by gauge, unless
otherwise stated.
Choice of the orker.—All clivers and caisson
workers who have to work at a greater pressure than
18 Ibs- shoulcl undergo a strict medical examination before
bcing admitted to work, and this examination shoulcl be
periodically repeated.
All men suffering from chronic disease, alcoholic
excess, ear troubles, &c., shoulcl be excluded, as well as
men who are at all fat or who have ever had any serious
symptoms after a reasonably slow decompression, since
Such an occurrence points strongly towards excessive
SLisceptibility to compressed air illness. For high pres-
sures the skinniest men available shoulcl be selected.
Compression.—T he rate of compression shoulcl be
SO regulated as not to cause any discomfort or pain in
the ears owing to incomplete opening of the Eustachian
tubes. A too rapid descent, or compression, might cause
mechanical injury followed by middle ear inflammation.
In the Royal Navy clivers can descend to 30 fathoms
two or three minutes, and when the exposure is to be
dt great depths, the descent shoulcl be as rapid as possible
• ii order to limit the time of Virtual exposure.
In the case of tunnel and caisson workers it is recom-
mended that the compression shoulcl be rather slower
than with clivers. This is because the diver has the
rate of compression under his own control, whereas with
caisson workers several men are in the air-lock together
and amongst them may be one or two who find a little
difficulty in inflating their Eustachian tubes quickly. A
rate ol 5 Ibs. in one minute for the first 15 Ibs., and 10 Ibs.
C1y minute afterwards, will be quite slow enough under