Centre Democrat. [volume] (Bellefonte, Pa.) 1848-1989, 1884-03-27
Scientific.

ny lisIT n IhCbHFn ny lHN hStlDn Oi
zinc. dust on chloropbylan. Its spec.
lrum is the same as that gwen by living
leaves.
Preparqtions are already in progress
for the meeting of the international
Polar Commission member, which is TO
as., mt 10 in Vienna on an early day next
May.
In sA Mining IN oIbc conditions suit
a6l" 'ot ac'tic a .ug Tia" oxidation OF
dry ng o, NJ. Ac1, Liyache finds that
ina gauc'e /, the IN | effective dIsiccat.
ing "geut.
A r'g" q 81 100 has been awarded
by The Tuin Ac,d.my of Sciences to
Mr.. Ilormuld Ra.. IN tor b. dis, oyeries
IN ,hs field OF As.yilm aud Baby lonian
Antiquities.
The Grand Duke of Mecklenburg
Schw' lin has conferred be. gold medal
for art and sciences upon u Nschtigal,
the We lluown African traveller. who il
now occupying the po.,rion of Consul.
General for the German Government at
Tunis.
A spectroscopic study Of the Pons.
Brooks comet bas been made with the
reflector OF O.50 metres at the Obserya
tory OF AlgierS by M. Oh. Trepid. The
results show that in lis visible parts the
spectrum Of the comet is identical with
that Of IN alr
Oo an expedition, which is expected
to last at least over two years. the Por.
tugese explorers, Senhores Capello, and
Ju'nS, have sailed for the west coast of
Africa. They go first to Loando, and
from that locality they will proceed
norihward TO Xaire.
Six full cnrgoes of iu,e were d d'scharg.
ed al Bremen, Germany, during the fret
nine months Of 1853. Four Of these
were imported from Calcutta by one
large German establishment. The total
quantity of jute thus received wasAbout
10000 bales, worth about $4,000.
Messrs. Ramsay and Young find that
the decomposition Of ammonia by hea,
commences at about jOO', and that il il
nearly equsl in extent with porcelain
glsss, iron, and asbesius, but at 7oO' am
monia ia almost completely decomposed
by passing through An iron tube. Cop
per, when heated, is not so active
The galvanic. temperature eoef8cient
of steel, rod.iron, and cUt.iron have
been determined by V. Strouhal and c
Baru'. For steel this coefiicient dimin
ishes a. the hardness Of tempering in
creAses, while the specific resistance in
creWes with the hardness. Glass hare
steel has about three times the specih,
resistance Of soft steel
In large Berlin establishment fol
the manufacture Of wooden penholder,
8 fire lately occurred in one Of the dry
ing rooms. These rooms are heated
with steam pipes, capped with an alloy
which melis at a low temperature The
FIRE was not discovered until the nois,
Of escaping steam attracted attention
when it WA found to be already e1tin
guishcd, though having done consider
able damage 10 the stock.
wolgemuth. the conductor Of the
Austrian polar expedition, bAs told some
of the results ~ his work at q late
meeting Of the Vienna Geographical
Society. lie observed l24 auroras, about
ten Of which we're crown shaped.
Among the old lava streams ard in the
crsvices Of the old and numerous craters
Of the island Of Jan Aayen he discov
cred traces Of siill Progressing volcsn.
ic activity, and three times observed
wellmarked subterraneAn shockA
NJ. Masear,'s magnetic induction com
Prss comprises an azimuth circle upon
which move, an Arran cement carrying
the angle which this ring makes with
the horizon is measured by . vertical
circle the frame, 0.l2 metre in diane.
ter, is supported by the ring, and can
turn upon an axle perpendiculsrito that
Of the ring. The dimensions Of the in.
strument are not greater than those Of
an inclination compass.
Herr II. Wild in a late number Of the
An"aien der PAyik sssi Ciemis describes
an application Of his photomoter as .
srectro.phoiometer. This instrument,
constructed by Hermann 4 Pfislcr, Of
Berne, contains sIit, calc-spar rhom.
bohedron, . Foueault prism, a second
rhombohedron, selenite plate, Nicol
prism, fivc-prism Amici, direet.vision
prisms, and sundry lenses. The light
to be examined has to pass through
these successively.