Wauwatosa news. [volume] (Wauwatosa, Wis.) 1900-1948, 1912-11-15

q. ~ 1t would probably cost more
TO raise her and repair her
than to build a new ship.
Her value as old iron, on the other
hand. would not pay for raising and
breaking up. She may however, be in
the way of other ships, a danger to
navigation generally, and then she is
sometimes blown to pieces by a judi
ciously placed charge of dynamite.
1t is usually worth while, however,
to save parts of wreck, If by any
means they can be got at. Brass
work, for example, is OF sufficient
value to be worth getting, and, of
course. If gold or silver-either in the
form of coins or bars-be a part of
the cargo, then it is certainly worth
an attempt
Sometimes even that is impossible.
because of the depth at which the
wreck lies. AS a diver descends the
water pressure increases, and to keep
him from being crushed by it the pres
sure of air in his dress has to be in
creased to the same extent. and there
is a limit to the amount of air pres
sure which a man can stand. The
main trouble is that his blood becomes
aerated under the pressure.
Its condition becomes like that of
soda water in a corked bottle. and as
soon as he commences to ascend and
the pressure is reduced Ii becomes
like soda water with the cork out.
The nitrogen which was forced into
, y h.
as the pressure falls, and if this be
allowed to occur too vigorously it will
result in the Divers death.
About thirty-ive fathoms is the
limit below which man cannot 60
and even at that, if the diver has to
stay down any lengthof time. he must
ascend again by easy stages with long
intervals of rest for his blood to get
rid of the absorbed air; so that his
ascent will take as much as four
hours. Four hours spent in coming
to the surface after but one hours
work below-f1ve or more hours
wages for one hours work to an ex-
pensive man like a diver. to say moth
ing Of the wages of his attendants
makes deep water diving an expensive
matter, and beyond the limit men
toned is out of the question alto
gether
Diving In Strong Currents.
Then there is the trouble caused by
strong tides and undercurrents. The
diver when in the water is the play
thing of the currents. Robert Louis
Stevenson, who once ventured on a
diving expedition. describes himself as
being blown sideways like a leaf :
when in the water. Even large. heavy
bodies like ships of iron are some
times carried to long distances by
the currents. 1t is said that the naval
authorities have thus lost entirely an
old submarine which they sank for
the purpose of trying salvage expert
ments.
They knew the spot where it went
down, but when they tried to salye 1t
IT was not there. The under current
had carried it away 1t is obvious,
therefore, that diving in places where
tide or current runs strongly is very
difficult
entirely upon the diver. Suppose that
ship is sunk in collision. He first
goes down and examines the wreck.
Upon his report it is decided whether
1t is worth while to attempt to salve
the ship as a whole. 1t not, he may be
told to salve the brass fittings, so down
he will go again and again. with tools
suitable for the work and will remove
from the ship and send up all that he
can procure that is worth saving.
If there be treasure on board he Is
the man who will have to get It. He
may be able to make his way to the
place where it is kept by the ordinary
means, but sometimes he will have to
blast holes in the vessels hull in order
10 obtain access to it. Hundreds OF
thousands of pounds have been
fetched from the sea in this manner
Sometimes there are among the car
go things which are worth saving,
and the diver has to get-them out by
similar methods.
If the whole wreck is to be saved.
he has even more difficult feats to
perform. For example, very COM