Method of use: For the
first eight minutes, the apparatus is used with the two-way cock (no 5
on the picture) in the horizontal position. The diver thus inhales from
the inhale bag (7) through the inhaling non-return valve (4) in the
mouthpiece, and exhales via the mouthpiece non-return valve (3) straight
to atmosphere. He replenishes the bag by using the by-pass valve on the
reducing valve in the chamber. After eight minutes, he turns the cock(5)
to the vertical position, and, while still inhaling as before, he now
exhales through the exhaling bag (8), through canister (6) and back into
the inhale bag. The oxygen supply is maintained by the automatic flow
from the reducing valve. At the end of each stage of the decompression,
or whenever the breathing bags become fully distended, the diver empties
the exhale bag by pressing on it and squeezing gas out through the
pressure release valve (9). He then “top-up” by working the by-pass
again. This gets rid of the nitrogen or helium being given off by the
body, and refreshes the oxygen in the system. Breathing is carried out
by the mouth only, the nose being closed by a clip supplied.
Alternatively, an ori-nasal mask, to which a small microphone
transmitter may be fitted, may be used in place of the mouthpiece and
nose-clip.
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