Year: 1870

ance whatever occurred among the workm On afssr
the watches were reduced 70 one hour. satisfies me
by lessening sti more the duration Of the Watches
depth considerably greater can be reached without
the air-chamber was almost invariably followed by
symptoms OF exhaustion and paralysis. Dr. Jaminet,
hours when the depS was over ninety feet and Was
dangerously attacked soon after reaching home.


symptoms Of paralysis rarely occurred In the
ana never In the air.lock or air.chamber.


LIGHTING THE cAIssos.


"A dinerent method Of lighting the air-chamber VIII
De adopted. In the other cassons much inconve.
nence was experienced on account OF the particles
the candles used. Tine consnmpiion OF 1he canales
under the action OF the compressed air was much
more rapid than In the normal atmosphere. At the
three-nfths OF the time required in the open
ar Large quantities or smoke were emitted
u noating carbon which could only be removed
thoroughly by placing rose Jet on the nozzle OF
spray In every direction. Some amelioration OF the
evil was obtained by burning the candles under an
one Of the snats BY small oaet ppe tSroua w.
which the escape Of the compressed AR was regu-
lated BY anc cock mus sseSsg Ms Sras above the


The calcium Light would probably prove the
most satisfactory one which could oe employed
cost OF il in this city, For the one hundred
dty days which Will be required In sinking this
pier and completing lts foundation on the rock, the
cost OF lighting the three compartments OF the cham
ber with calcium lights would be at least 200. BY
the means devised for the purpose the cost cannot
exceed Oue-h(th OF that sum.


Inc difficulty Of cxtinguishing name In ON at
mosphere OF such density caused me TO forbid the
use OF oil lamps IN the chamber before u depth OF
eighty feet mad been reached. The clothing OF TWO
OF the men having taken fire from contact with some
OF the hand lamps or candles used In the casson, it
was found exceedingly difficult TO extinguish the
names. ono OF them was severely burned, although
MS garments were almost entirely woolfen. It was
deemed unsafe TO risk the danger OF having the
clothing Of the men saturatef with oil from the
cldental breaking OF q lamp which might by the
same casualty, ignite their garments and thus en-
danger taer lives The use OF OIL was therefore for
hidden.


Al the depth OF eighty feet 1t was found that the
name o. candle would Immediately return To the
depth Of l0S1a eet below the surface OF the river
blew out the name OF one OF them thirteen conseeu-
tive times In the course OF NAH minnte and each
time, excepting the last IL returned to It's wick.
Almost as long as sman portion OF the wick re-
mained incandescent the 1ame would return, and
failed TO possess sufficient heat to restore the fame
to either II would reappear at once by placing the
luminous portions Of the two wicks In contact.
The chamber OF this calssOn will be lighted by can.
dlcs contained within glass globes OF similar con-
struction to those used In lighting railway carriages.
The glass VIII be Of strength sufficient to sustain the
external pressure or the condensed air. The CHM
ter communicating with one OF the shafts ana the
compressed air will only be admitted within the
globe In which the candle Is placed through smal
regulating valve. The candle will therefore be
burning under the normal pressure Of air. A STOP
cock In the chimney will prevent the escape air
sirable 10 put In another candle or 10 clean the
glass,