New-York daily tribune., 1851-07-12

Foucault has chosen the one which may be con-
s,dered as the simplest and most perfect. In lacl,
by the use OF this machine, the blind are even
more favorably circumstanced than those VINO
are able TO see, lnasmuch, as they are enaoieo
TO write without having learned how 10 'orn
single letter All that is required IS, TO kno"
how 10 read by the touch, in order 10 oe capa-
HE of expressing their IDEAS IN an elalnentiy
legibe manner, since all ,he letters are ~ 'yPo-
graphic characters.
"The process employed 70 obtain tins interest
ing result IS as follows: All the letters Oi lue
alphabet executed IN reLei and OF large oiiheii-
sions are hxed ~ the upper extreuh'y oi q
metallic rod, made 10 slide longtuulnaiis' VIZ :
suitable contiguous canal; they are plaCou ~
the same plane, and IN the TORN OF a. go
nj them exhibiting on It's lower part the sd,iie
le,ter as on lis upper part. THIS letter. OF d
small size. j. exactly that OF printing chafdT
,er. The mechanical arrangement is such' ina d,
Tho letters converge towards the same poihl' an
on beIne successively pressed by the hngers' the
impress of each becomes placed above, forming
only black MASS; bat whenever letter Il
touched. the PAPER by the same movement
changes its place and thus the writing, or ralher
nrintlnp is produced. which Is at the same tiihe
distinct. well arranged, and properly spaced'-
when the line is finished. the paper chdheeS
Mace in a perpendicular direction to the ioIhei'
and the operation is renewed. ..x,,i,.,
In addition TO this, series OF types ,n5
cinbers and all the supplementary MARKS useu
f;., ;s nIaced in the same way, and IN
nIane convergent with the former; the genera
aarranrement being, that all the types, Whatever
,beir order NAV have been at first, set their I'M
nress on the same point. NJ. Foucault prefers
the use OF tracing paper such as is employed III
coryinr machines. The manipulation Is eA-
tremely simple, and admits OF great rapldi'y OF
execution T.,
cault. irho himself is bind,) on the great success
which has crowned his long continued efforts 10
promote the great philanthroPic object OF teach-
inc the blind to write. 1t appears that ne mas
been engaged for several years In the construc-
tion and perfecting Of his machine, when, oy MS
latest Improvements, appears TO have attained a
degree of perfection almost unlocked LOT. NJ
Foucaut's machine is shown IN the rrehch ue-
partment of the London Exhibition.
ARTIFICIAL TOPAZ. M. Daubree has
communicated to the Pans Academy OF Sciences
the results of some researches on the ar'lhcial
formation of Topaz. Pure aumlna previously
calcined by bright red heat, Is submitted 10 the
action of a current of fuorlde OF silicon. After
two exposures OF this kind the alumlna increased
IN weight 10 per cent. The product contained
huorlne. and what was more, tins ftuorne Is III
such state of combination as not TO be acted
upon by boiling concentrated sulphurc acid. BY
this characteristic alone, the substance produced
offers great resemblance to topaz, the four con
stituent elements of which it also contains.
quantitatiye ANALYSIS indicated It's very near aP-
proach TO, if not identity with, topaz. It's iden.
tty, which is 347, Is the same as that Of natural
topaz.
METEOROLOGICAL one of the meetings
of the Paris Academy in May, NM. Boussmgault
and Arapo made their report on the cOmmunlca-
ton presented to the Academy by VI. Charles
Aguirre, containing variety of tables and met
geological observations made by hlm at Antlsana,
near Quito, during his residence at the latter
place The farmhouse of Antlsana Is situated
1850 metres above the level OF the sea. During
one entire year, from December lsi5 TO Decem-
Der, 1896 NJ Agulrre from sunrise TO the close
of the day, and sometimes throughout the whole
night, took hourly observations with the barome-
ter, thermometer and hygrometer. The nstru-
ments used by NJ Aguine had previously been
adjusted and compared with those al the Pans
Observatory The Academy ordered the insertion
OF NJ Agirre's valuable communication IN the
RscueJ{ DIES sQrQnfs efYdrgtTS.