Compressed Air Work And Diving 1909
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THE DI VING DRESS.
21
air inside the helmet from falling below that caused by
the head of water at a level about 3 in. below it.
On the right-hand side of the helmet, just behind the
glass winclow, is the escape valve, fittecl with a weak
spring for the escape of surplus air. It is closecl by a
perforatecl plug which can be screwed in or out accorcling
as the diver wishes to raise or lower the pressure in the
helmet and dress.
O11 the right-hand side in front of the window,
and lower clown than the escape valve, is a supple-
mentary valve which is closecl by the cliver just before
going under the water. It is not an essential part of the
apparatus, but is used by professional divers for taking
in water into the mouth for the purpose of washing down
condensed moisture on the face-plate.
I wo lead weights, back and front, weighing 36 to
40 Ibs. each, and boots with thick lead soles weighing
16 Ibs. each, and a belt with knife attached complete the
outfit. 1 he lead weights and lead-soled shoes are to
cause the cliver to sink, since in his dress and helmet he
will be very much lighter than the water displaced.
When the cliver is getting ready for a descent he puts
on over his underclothing a white woollen jersey and a
pair of woollen pants. One or two pairs of woollen stock-
ings are then put on and drawn up over the pants. He
then steps into the dress and sits clown whilst the attend-
ant pulis up the feet of the dress until the diver’s feet are
well into them. He then stands up, and having had the
backs of his hands well soaped, with the help of the
attenclant works them through the tight rubber wrist-
bands. If the cliver has small wrists, it is sometimes a
good plan to first wrap round them strips of washleather
about 2 in. wide and about 15 in. long. These should
be slightly moistened, and have a piece of string attached