New-York daily tribune. [volume] (New-York [N.Y.]) 1842-1866, 1857-04-04
s,.a. nseps.y 30 81 10 Civ" powerful 'oooRh
la,se Quantity 20 ss TO fuse metas"

-. ~ n,,,uu,,rt which promlsss - be- v-rs Useful
N ceptifc usve ers Soppo-e The cav-tte Of oI'n
.,,o h. ne,d N q tsbo, ana the gi.-s too, %
.,,.,o.d ma 10 sdut Of ia brig bfsed ny hsod the
,,,o. ,.ouir.d 10 hft tie tube vi ! be equal to the
,ioh, of the tube pu. the weight If the mercury ia
II which ls., is the amount Of atmospheric .ssu'e %
a section Of the tube. As coOs-qoencs, II the tune
40 lifted i. attached 70 a balance aud wei. he'd 1e
re-, nit ii indicate the atmosphere pressure. Tee IN
,,,uuept which has been made = and IL used in The
observatory al Rene oopssts 81 tube attached to
the ind of steely ard ~tich cares AT the o:hef
End o count.rba ace weigh, and poloter, when
i, reflected 10 mirror. In this minor il ais"
T. ct.d .c.le in such manner rh,t motion OF one
ne Of the pointer L indicated by motion of -iT loes
oi The fect.d in age. The profes-or .nunerstes too
following adv tages as spperainipg 70 h's ioveau n;
!. Tue tube, beng 10 longer Looked torouSr, oa'
weighed, nay be C instructed Of iroa. 2 Tue new
construction lie independent of the form Of the Minis
Gus # ne purity of the mercury, and "f the temPera
tore aid di,Iepce Of gravity peculiar tn disreot a
tudes sl.o of variations the density OF the IN
cuIy resulting from the last.named cau'es 8. tn"I
Moisture ard air do lot adhere 10 ron a. t1ev % W
psss. L. That the mercury nay be boiled 80 often as
desired without fear OF bursting
ATLANTIC SUBMARINE CABLL-Ths effect OF the
INN, pfe pressure 10 which the cable vii b, exp~ch
when at toe bottom of the sea- yet totally unknown
II feared hst where toe ga "a percha Is Dot perfect
AMI contains air bubbles the w,ter viii fod is Wy to
the wne. ard thus destroy insulation Neither IL 1t
kI own that the presssrs will moi modify TIE laws OF
electricity tpst have been found to ext under modsf
ale D ess ure DOR that it Will not cnanse the chsn;a
properties of the substance. plan Of testing has
been proposed, which consists in placing nuo fred
miles of wire in . large castiron txhk with ctufhns
boxes here the wire her. ana leaves snd t0-n SUD-
ectpg TO b. oiostatc pressur.-an electric current
beng n the mean time sebt through the wire. W. Do
MT believe it practically possible 10 create in large
iron tank pressure great ss that Of the Sea on ths
great plateau but It would undoubtedly be pruoent TO
Try the effect f pressure on yard Of covered wire
In guf barrel made thicker than usual the purpose
RAILROADS IN IRELAND AND IN ESeLAsD The
capita expended on Inch railroads If sb ut SIS &c.,
OOO al the number Of miles built Ii OOO giving 81
sv.,spe Of SIS 0C0 per m, about ooe half the whole
krgth IL in Eli gle iues. The average ouilsy as In
e, gland 1900 per mile In Ireland toe working er.
pep.e. are Al per csnt Of the gross receps in England
4S Der It. inc uding tsIes from which the irsn roads
are exempt The receipts per mile in England wero
t2jp tsr week: in IrelanI, el00 out the div tsnds
average 4O3 per cent, and in England only 3 Is per
cent.
Acr1os OF TEMPERATURE on IsosExpenments
have been made on this subject by Me-. W. F,iioaird,
arc the result reported to the Britannia ssecaion
op wss found stronger at 2l6o fahrenheit than st any
other Temperature Wien heated to dark I'D it loses
t~o-thnds of ms stIeI lth and when cooled to 80
beow z.ro It loses one.tnid of its strength. II this
4 IT raiIrn
may be ready for all weather oy making toeir IA
chimes 20 per cent stronger than usual for those kept
inside the buildings.
SUB.SIRrrTs The French Government has or.
dered the cor sruciion OF subsre.s 10 the new streets
that were oImtd Pars, forne purpose or laying the
different pipes for erage water, gas and tor tele'
gsptic wires The result has not yet been fun very
sstisfactory The same project is sb ut TO bs car
ried INTO practice in London, in the new streets OF
soutbu ark and Westminster and the Board Of Works
offer przee of GlOO, $50 and Go fJr the three beet
desgns.
Among the various applications Of this instrum ut
DIFF rDg from lie ordinary barometer, which
have been .usgested there is but one Of real value
II consists in cohnec ing the poner of the instrument
with on electric current, passing around the electro
mae1et in .uch that the circuit will oe ciO-ed
for the pressure corresponding to boIious gases. Toe
electromagnetic would be MADE ~ oct upon an alarum,
ard thus VAN the workmso Of the CANCER.
IRON MINIS IN IsDIA The Government of Bengal
be-. just published report on tne ron fields examined
at Bavral by M. smith. The pace is near the l.ss
station Of an eIisog ral~sy, and not far fro navi
gable rivers. The quantity of ore is estimated at
g. 400 COO tupr TO the square mile. pit has beea lug
to So feet psrsug through 80 inches Of clay oo
and 81 inches OF ack oapd non ore.
TINBrK II Coal MINES The shaft at Andreasberg
il 6IO fboms deep and IT has been fnnd there that
the TIMBER can be preserved by being oos.iousIy
MORT. peo With cold water. Pp's have bseo carried
Fl, the surface, ana plugs placed 10 them for this
purpose.
ELECTRIC TELEGRAPHs III ACsrRALIA.-Ths we're
70 niles in Working orrer IN 1854 ~hcn were Increased
to pea,ly 300 miles at the end Of 1885, and there are
now 800 miles more under contract