New-York daily tribune. [volume] (New-York [N.Y.]) 1842-1866, 1860-10-27
SCIENTIFIC.

The mlnri0De enect Vi quiosshFoi "PN
Of yersens engaged In the manufacture OF mirrors "
well known leading either to an early death or nsp-
less old age. Medical science has in VAN atIeinp'eu
remedy the evil. In Fdrtn and Nuremberg ootn no'e'
for the fabrication Of looking glasses in various Shapes
the s.rcsest sanitary regulations have only resaea III
eighty diminishing the proportion OF deaths among
the artisans The at ention Of Liebig was called 70
this fact early 1896, and re instituted series OF
experiments having for obj the substitution OF
silver FOR quicksilver as a edum Of specuar rehec-
iion. He succeeded in making silyered mirrors, bat
TIE process expensive and the results imperfect
His Investigations led to Others and Drsyton Of Lon
dom ard Pet an Of Paris, established manufactures
of timsr mirrors. But hose Of the former we're too
eosly 10 into general nee and those Of the latter
after few months became fssked and at ast useless.
Meanwhile, Lebg not idle, and about four years
ego he devised cheap and simple method Of coating
ess with silver. Shortly aferward company
as formed Of Doos, consisting Of Mr.. Cramer, CAPT
taist AID Dr. Schindliug ons of Liebigs pupils for
tie purpose Of providing the trade with pVered mir
rors BY Liebigs process, the svering OF tie glass
occupied only from TO "A hours The metal is after
ward covered by gavsDoplastic process Wlh coat
ing of copper, which is preserved from oxidation oy
another coatiog of varnsh. The silver is one-sxtesn
tbougpdth of nillimster in thickness Ia milimeter
being C3937 Of an iuch and the coat OF the mirrors
when fpished is no mere than the quickslvered ones
Thew have been submitted to all ests and are found
sf,er three wears use to be "a perfect when fret
made So firmly ia the silver attached to the plate
that the action Of furIac fails TO separate the metal
from the 2 ass They reflect IS has been found oy
ex.eriment 90 ger cent more lgbt than the cid nit
rors. There ia 10 doubt that few years more will
rness the general substitution Of svered mirrors for
the unhealthy qnicksilvered looking-gissses Bros
sete of Paris has also patented method OF slyellng
glass for reflective purposes but bis process found to
be sfs effective than that of Lisbigs, although ap'
proved by some French chemists of note.
-Faradsy, at the Royal Irstiution, lately described
new ard invaluable application Ct electricity to the
Jacquard silk LOOM The products Of this loom are 90
infinitely perfect that artists of the highes raaE can
not without close inspection distinguish them from
the most exsc. enqsyings. Auy effect Of pattern,
either simple or complicated which is produced in the
woven product, depends upon the amer in which the
threads Of the warp are separated before the weft
thrown and the successive rearangs Of the warp
threads which are brought about each time the shuttle
10 ras,ed. single thread of TIE welt, therefore,
preeents an eemsnt Ct the design; and in this loom
each Of them formerly required card pierced in GER
tain order which, being brought against the ends of
set of horizontal reds allowed some OF these rods TO
remain undisturbed, while others pushed on one
SIDE BY the action Of the pedal, the warp threads
assoeated with the undstorbed rods raised aod
thcse belonging TO the displaced rods were LETT IN
moved To do this correctly separately pierced card
was required for every thread that cIossd the warp
within The extent Of Ihs pattern. Frequently some
IL II ro.. ba ofrct i,n
of woven portrait Of jacquard, in black and white
silk as many as a 900 were employed. The prepars
ton and piercing OF these cards demanded the expend
ture Of much time, Skill and labor after which they
had TO be carefully joined together In an endless cham
in their proper order. M. Bones invention subsu-
tued for this part Of the weaving arrangements SIN
Gle card 60 pierced TO represent by It's successive
changes of condition aud place the numerous cards OF
| jacquard. By means of electricity these various
char gs in the position and character of the card are
brought about. The inventor has conferred an In
estinable boon upon the silk-weaveTs OF France.
Some worlmen engaged In excavstiDg Tor the new
stone vaults of the Phenix Brewery Dover, which is
situated lear the old walls of the city have brought
| TO light dozen large stone and iron balls, and a
Roman urn. The balls have the appearance OF those
used by the Romans in their ballista or sliDgs. At
Lyons on the Qusi des Etroits, some excavations
have resulted in the finding of antique tombstone,
bearing Latin inscription in the weu-formed char
acters of the second century, the effect that To the
| gods names and the eternal memory Of Nalerius
Valla fellow warrior, formerly Decurion Of
Lyons, Julius FirmiDius, DecuIion, Questor OF
LYONS, has caused this monument to be erected.
An urn With the ashes of the deceased was found with
the tombstone. Two large finds Of coins are TO
ported from Sweden ofthem in the island Of Goth
land and composed principally of ApgloSsxon pieces.
The numismatic yield Of thisisland with whose capital
| wsby the old English maintained for over two
| centuries thriving commerce, hae made the coin
cabinets OF the North richer and more complete in the
series of Anglo Saxon Kings than the collections Of
| England itself.
In one Of the last sngs of the French Academy OF
Sciences the old problem of the quadrsure Of the cir
Gle wac again brought before that body. M. Manly,
in q communication, insisted that the Academy should
receive and examine bis solution of the problems IN
which he CLAIMS TO have overcome the imaginary in-
possibility with which Of science have 80 long in-
| vested the matter. The Academy declined to have
| ANYTHING to do with n. Manbys proposition. AT a
later stage NJ Despretz asked bis associates TO consent
| TO the examination of a very ingenious appara-
| tins Invented by NJ. Chuir, which measured
with a close approximation to correctness, the
length of given circumference in its relations to the
dsme er. He stated that this proposition was totally
different from that submitted by NJ Manly. In reply
to this NJ Duhamel sad that he could not see why the
communication should be treated in any other manner
| than that awarded to NJ. Manbys application He re-
GREETED tat Lis colleague had introduced this subject
| TIE mater then dropped.
| The Swiss savans are now engaged in discussion
concerning the extent of the period during which the
human species has existed. From the fact that human