New-York daily tribune. [volume] (New-York [N.Y.]) 1842-1866, 1860-07-11

faotaTed by the tun in DE la Rues establishment and,
being greatly cheaper than animal parchment is ind
log numerous applications Chloride Of zinc has lat
terly been found to produce the transformation
In paper, fact of much theoretical interest
The vegetable parchment strange to say is identical
In composition with the original paper Beautiful and
valuable for many purposes this material is it has
come disadvantages, for it is not easy to write
With pen and ink, and the printed well written
characters are as easily erased without leaving any
trace Of the scraping tool.
NIw ILLUMINATING AGENT.-It has recently been
proposed in Paris by NJ. Bunsen to employ the metal
magnesium for producing Light by its combustion.
This metal is the base of magneSia as aluminium is of
alumua an6 much less known than the latter metal
though il is but short that time both regarded
alike obscure and useless Aluminium is remarkable for
its ghtncss being only about efourth the weight of
silver; but magnesium weighs only about two-thirds
as much as aluminium, its specific gravity being La
1t resembles silver and s not readily oxydzed even in
moist air II can be hammered out anvil, aud
drawn into wire. II is prepared by accompanying the
chloride Of the metal at red heat in close crucble
by means Of potassium or sodium. The metal takes
fire at the temperature at which bottle glass mets, and
burns with quiet and excessively vivid light. From
the experiments Of Messrs. Bunson and Roscoe 1t
appears that its Illuminating power is very great.
wire l-l0Oth of an inch in diameter while burning
gives Light equal 10 that Of "a stearn candles of five
20 the pound Such wire three feet long, and weigh
ing nearly grains, continues to give this light for
one minute. IN ten hours 10 obtain the ime light
from the candles, there would be consumed about %
pounds ayoirdupois) of stearn, while of magnesium,
the consumption would be only between two and three
ounces.
1t ia proposed to keep the wire rolled upon bobbins
b, n
the fame of an alcohol lamp as fast as required The
apparatus will be of the most portable character and
may be advantageously applied where large and ex
peDsive lights Of great intensity employed, for
lighthouses. portable light Of this character has
been great desderatum for the heotrope instruments
employed upon the United States Coast Survey, and if
1t be too expensive is likely to find early appi
cation upon such works. Its effect be multiplied
by the employment Of larger wires Of several to-
getber.
The fame is remarkable for it uniformity and steadi-
ness and possesses extraordinary chemical or photo
che mical power, all of which are properties that
render it peculiarly adapted for photographng oy night
or ia places to which the light of dag cannot penetrate.
As regards economy it is expensive material at
present than candles; bat, with demand requiring its
use for practical purposes it can probably be furnished
at much less cost than when prepared as heretofore
only az philosophical curiosity Its price at Vienna
Ia quoted at 780f the gIamme, about 30 cents per
or.in Even this high price, il is thought, viii not
prevent its being used for phoographing- duration
of the light required for any operation not exceeding
about half minute.
psyv.RATIoS OF DRYING OIL.-To obtain cheaply an
oil which Is az once coloress and RAPID dryer mas
long been desderatum. Latteriy, oxyd or oorate OF
,raoca,ese has been much employed in lieu of oxyd
4. rly rel led
tbs "drving" agents are bodies which, easily part
tnO with oxygen have an oxydizing effect, Binks has
made use Of the most universal and the cheapest OK
yd;zer viz the atmosphere, in new and ingenious
Man Of nreparfog siccative OIL The hnseed oil ~
ia5 sith two TO six thOusandhs Of sulphate OF man.
vspsse AND Hharge, and heated for half an hour to
tAH3 Fahrenheit then, by mechanical means, an ex-
eaaanglv divided current Of air passed through the
mixture the Temperature being maintained al aoout
1902 IL this way, and in short time, colorless oil
!. obtained During the process 1t thickens, ana oy
operatipg long enough it may be made almost sono'
The cost is said not to exceed dollar per tun, and
In mart balanced 10y the ncesse in weight experienced
nv ,he oil. which amounts TO three per cent
Is.o1rR1r,TY OF ARSENIC IN PRESENCE OF FATTY
M.77xR.-Blondlot has found that the slightest con-
tact If arsenic with an oil fat snhces to diminsn s
.oulty 10 from one-feenth to one-Iwenlsth Oi "hA'
oldb be otherwise either in pure water or In shght
Iraeid or alkaline liquids This fact explains why arse
mic !, sometimes overlooked in genealogical exanina-
tioos when sought for in fatty liquids as soups IL
demonstrates the value Of oily matters as anhdoeS "
this toiscp explains how arsenic may remain "i'uou'
action in tbe stomach for time, and makes clear
tine statement Of Morgagni that juggierS actually S"
low tb poison before their sudiesces-prevousiy uh
ing milk and OIL and not forgetting an emetic when 'ne
pablo performance is over.
ANEW SoRGHo SuGAR Observation-Disclosures NIL
ler Of Laporte Indiana, has recently patented sugar
boiler on new principle, which may be desc lied as
being two halves Of circular PAM six feet in diameter
aud Six inches deep, which are boted together, out
Sci niue cis'anee apart SO to leave an air space
between he PARALLEL sides ofthe pans The two halves
OF the Pa Deihs Filled with sorghum juice that in one
side may be boiled up to the point of granulaton and
then turned on the lire prevent burning the rotation
bringing the liquid IN the other half over the fire to be
boiled ia it turn. We have bean shown by the Rev.
Mr Lane sample Of tolerabe sugar made in the sp-
paratus at an expense, it is claimed, of not over two
cents per pound.
BLrAoHIso CoLoPHoEY.-Rosin, or, as It is often
termed, colophony from Colophoin lonia, whence it
Ias once obtained is employed to an enormous extent
IN the rarufacture of soaps and yarnshes, and for
eazing o. sizing paper IT. dark color ls oen once
fs4,i f sbese uses and the methods of deeoloTinng
tsatks0