The farmer and mechanic., 1915-04-27

4
ignorance of their bosses or them
selves than by the hardship Of their
calling. The air pressure may be
perfect, and a man may go into
caisson quickly and stay for hours. or
diver may go down to the bottom
IN few seconds and stay long. with
| cut any harm.
| fearful pressure Of the compressed
| air saturates his system with the nj
| trOgen that forms 10 per cent. of
punre atmosphere. The oxygen he as
| Stimulates without harm. The nitro
/ gen fills his blood and tissues with |
| millions Of gas bubbles. These must |
| escape gradually He is like j |
| charged siphon that must not now be |
exposed If the diver comes up |
| quickly from great depth. his system |
| loaded with these bubbles of nitrogen |
his reward is divers palsy. the bends, |
ca1SSon disease, and death.
The celebrated English dixter, Al
| exander Lambert. who dived thirty
three times in recovering a third of
a million in gold from a wreck 1876
feet down was paralyzed for life be-
cause he came up in five minutes af
ter he had been at the bottom three
quarters of an hour He was so sat
urated with nitrogen bubbles that he
blew up" If he had taken an hour
!, or SO to float to the surface~by easy
stages he would have been safe.
1t was off Roanoke Point. in the
: Sound, as the Wake anchored III
) twenty-three fathons 138) that Grill
! ley and Anderson and Drelishak went
down again. Anderson only stayed
on bottom seven minutes; but he
took twenty minutes to rise. Drel-
lishak walked about on the bed Of
e the Sound twenty-five minutes. and
i took thirty-two minutes to float up.
<
e lowed himself thirty seven minutes to
!, rise after he had spent only twenty
e minutes at the lowest depth.
/, When the destroyer Wake found
II Iorty-nVe fathoms Of water at The
i Race, she cast anchor to let the Yam
Q kee divnrs prove how deep down q
n human being may walk the
n oceans bed The sea was choppy
+ The tide crossed the wind The war
J. ship was in deeper water than any
r.. III which a diver had ever gone tt
J. the bottom and lived
l. The true depth at The Race wa
TO found by a 32-pound lead at the-ent
le of a length Of piano wire. 1t wa
vertical when the lead touched bot
"a tom. A mark was made at tn,
" waters edge, and the sounding meas
IN ured by steel tape as the wire wa
tn hauled in. Forty-five fathoms an
hit tWo-thirds of a fathon more 27
ut feet, was announced by Ensign F. N
s. Collier, L. S. N, and the ships quar-
at termasters checked this depth b
OF their own soundings with a speca
at hand lead Of 80 pounds. Lieu
a Thibault the ships commando,
nv watched it and vouches for it. SO di
ct all the sailors who could gather nea
Ii The exact spot was fixed by eros
tn bearings-Race Rock Light. 81 d.
IS grees true, 5.575 yards, Little Gu
cd Light, 179 degrees true, 800 yard
,et And while all this was going O
TO DrelHshak was getting more attentio
at from his chief and his envious mat,
than he ever got before. 1t was lii
le grooming an nntry for the Derb
Nv When he went down the ladder. OF
le- big leaden foot at a time, and disal
in peared in the green, 1unglng waite
oh by the Wake, the whole ships ere
+o was a-hush.
for Hanging down 80 feet below tt
ds. surface from the ship was anoth
FOR ladder made Of rope, heavy weigh
m holding it taut. It had rungs on
every ten feet, enabling DreIlishak
re- descend by easy stages, debating h
wn suit as hn went and getting more a
by pressure from the pumps above. TT
his Jacobs ladder is of greatest benefit
in the diver when coming up. Witho
es- it, he could not rest, safe fro
es- currents, and might fail to er
i'm erge where his helpers stood rea
DIV. to assist.
The But the Jacobs ladder hangs or
en- 50. feet down, ana Drel1shaK Is SO
not 10o rect pelOW ot1llSon hSlens
md the divers words every sound. '
nds stand about, helpless, transfixed
no wonder at the uncanny sounds COZ
lat ing from the receiver at Sullsol
IN ears. More ar, we near DrelISh
,Wn call. Ine pumps raise the surIa
his gauge from $50 pounds to 175 to
was square inch. All rich comes frt
the below, flower away" and we he
ater him tell Of the bottom he is on, a
, to that the So-pound weight at the fl
to u Tie ueoCeIu1ii6 mo - oSliiS pus
his ed OH the Dotto1n oy the uoe-
tells Us the tide is running fas
down there. His voice sounds met
do lie All voices sound alike from
- di.-ir,cr tclrnat in q