New-York daily tribune., 1857-04-25

tihCk. In similar cases. where is necessary to leave
train ut once and when the velocity il too great for
jumping, ia the usual way we should suggest Jumping
backward as the safest. Place yourself on the sep
of the car looking toward the end OF the rs'n ana
jump sideways az high as you can, and when III ''e
cir screw your legs up and bend the head forward
You viii strike the ground with that psrt OF tue oouy
that nature has made feshy. to render 1t more 0on
vepent to sit upon; and before you know more you
will be far from the train having run from IL oAac'y
a. wheel would in similar circumstance.
Frycrp,c Crooks IN NIw-YoRK.-The contracts
c. ,ooLir, The electric clocks, which TO be placed
in al the public buildings of the CITY, have just been
made the Common Council having appropriated
.s ooo for tbe purpose. Similar arrangements have
,.., in psc for yeais in several English aud French
towns and have proved simple, eecual and cheap. On
the crownng shat of large clock constructed in the
psual way il placed wheel, the periphery Of which
il made of sixty alternate peces Of brass and ivory,
and against it one end Of the electric wire. made of
pstina il slightly pressed Supporting that the pendu
lum beats once in q second this circuit breaking
wheel will break or close the electric current once in
second. The electric wire il made TO 90 round the
city from one public building to another aud in each
is connected with electric magnet the armature of
which viii consequently beat once in q second.
ratchetwheel and two 0oth-whees with shafts, dial
and the hands will complete clock at every station.
This time-teegraph will be under the Of the Su-
perintendeut of the Police Telegraph The next step
will be to adopt the Boston PLAN there they have
fre.telegTaph and one man by touching key rings oil
the bss Of the city,
ORIGIN OF FoKoKs.-Allen, in his book entitled
Philosophy Of Nature supposes that the sun is
constantly sending us pOnderable fluid, OF which
light heat and electricity various forms and that
working forces are the result Of the motion Of thot
fluid, in the same they result from the mo-
ton of any other body Prof. foumans, who recently
loctured in New-YOrk chemical science, took the
same general ground and presented few happy illus
tratons Of this Hypothesis. When, Is few years ago,
the fashion was to hang pendulums from the top OF
buildings for the puposc Of proving the rotation the
earth after Faucaulds theory, ii was found that said
buildings used to rise slowly on the sunny side from
morning until . p. nl. and to down in the same
manner till sunset. The Bunker Hill Monument is
higher in the afternoon Of sunny day. The iron tun-
mel, 400 feet long, over the Mena in England affords
an opportunity of measuring the mechanical power of
the suns rays When heavy train tsay 400 tunsl is
in IT, the DETECTION in the middle is half inch; aor
the sun has warmed its top flooring few hours it ia
DETECTED upward one and a half inches.
LIrE-SAvISG AT SEA.-The inveption Of Captain
Bunker consists of two insulated Indiarubber plates
one for the breast, the other for the back bucked
together on the Sides and according to their size,
they possess all the buoyancy due to the fact that
water is about $50 times heavier than air. Capt B.
exhibits also a simarly.shaped corset made of thin
cotton fabrics, intended for bathing purposes only.
When dry it is perfect air sieve, but when wet it
keeps the air. and hole made in it with pin closes
Of itself soOn the pin is removed The fabric has
been immersed in proper bath, which leaves in 1t
spongy deposit. The preparation OF this bath Capt.
b. keeps for himself similar result may be obtained
BY the following process discovered year ago by the
celebrated Chemist Payen Make solution of acetate
Of lead and of alum mix them in equal quantities,
there will be formed phate of lead which will pre-
cipitate and an acetate Of alumna, which will remain
in solution; TO make fabric water proof plunge it in
the last solution, and let it dry.
FoRGED cREwTHREAD.-The ordinary process of
making the threads of bolts and is TO pass them
through screw plate by which part of the metal Is
cut out and part is raised to form the thread. The
new process of forging them is cheaper and gives
much better result Two dies are made, in the shape
of the half of nut The lower being stationary,
the upper is alternately raised and pressed down.
The workman has only to heat the end of the bolt aud
stamped on it. Such bolts and screws of three
eghths of an inch and upward for sale in this
city.
TELEGRAPH IN THr RED SEA.-All the arrange
ments are made to lay cable from Suez to kurra-
Chez as part of line from India to England. II Will
follow the regular commercial route. There will be
stations at the different ports, and it will he great
advantage to the transportation of merchandise and
passengers, by enabling vessels to receive and send
news on their way.
MANUFACTURE OF ARMS IL ENGLAND.-The SUBJ
joined extract is from article in The London Ne
eAanics Magazine of Feb. = on The Machinery ofthe
War Department" and is part of the substance of
paper read before the London Society of Arts by j.
Anderson, Inspector of Machinery at the WoOlwich
Arsenal:
"To insure perfect success. the "details of the small
arms machinery are being carried out by American
gentleman brought over by the Government, who pos
sesses thorough and ractiCal experience IN the
working Of this system IN the United States, and who
has the assistance OF several OF his own countrymen
frCm the small arms factories of New-England. The
bayonet from first to last, undcrgoes seveny-sI Oper-
aticns each OF which il definite and simple and at the
conclusion of the last one the several bayones are as
much alike the different pieces OF money from the
Mint and they present degree Of accuracy which
conld be cquaed. at three times the cost by
tools OF apparatus which have hitherto been employed
III England Inc american macIlineTy lhtIouuctu ihto
England by the War Department is peculiar that It
presents a rich mine of mechanical notions worthy OF
being studied 10y our machine makers. The gun-Stock
machinery, especially. is positive sddition to the
mechanical resources OF the nation.
The ECLIPSE oY MARCH %, AS SEN Al NFw-
ORLEANs.-Of all the celestial phenomena II has ever
been our fortune 10 witness we remember none that
could compare with that of the solar eclipse yesterday
for beauty and interest We viewed il from ele-
waited position, and watched it from lis commencement
10 its close through powerful glass and so were en-
abed to trace itS incidents with the utmost At