The Sun.
London, England, 1864-02-18 00:00:00

French Photographic Society,

The sitting of this society, which was held on Friday
last, presented some points of interest, An apparatus was
presented, by which a collodionised plate might be sensi-
tised without tousling it with the hands, it being held in a
kind of vice and dipped into the nitrate contained in a com-
partment below, adjoining which there were four other
compartments for the hyposulphite and other liquids. The
society then proceeded to vote the regulations for the
exhibition to be held this year in the Palais de Pin..
dustrie, conjointly with that of Living Artists; after
which M. Liebert, a Californian photographer, exhi-.
bited an apparatus of his own invention, by which enlarged
copies may be obtained with great ease and in the course of
two hours under the worst circumstances. The apparatus
consists of a cubic box in front, which receives the light
through a large meniscus, whereby it arrives condensed at
an objective, which re-expands it, casting the image on a
sensitised sheet of paper stretched on the base of a second
box of the form of a truncated pyramid, and situated at the
distance of about a metre from the objective, contrivances
being of course adopted for extending or contracting
the distance. The system rests on a support
provided with means for altering tire ftraihatioh,
and also for turning the apparatus horitontally so as to
follow the sun. A member of trite Society made some ob-
jections to the system, contending that without the aid of a
heliostat the rays( of the sun could never be correctly trans-
mitted through the centre of the objective, and that conse-
quently the image obtained must become indistiztet or i
double ; to which objection M. Liebert replied by petal's-
ing a large photograph. about 40 eentintetrea in height, and
not presenting the slightest defect, This practical illustra-
tionandCommission examine to
Witness its practical work
liostat was produr- -"`"• -
AStPrat 43
it ulislsSion,a
principle which the
cc-owing the rays of the stirs,in r- —might calculated to prevent arty ettOtor angles
motion, correcting
1 •esrt andt' that di
t'feorc nt
eb
yb
wtae7ena the
Taahnnogemlxecaaeenthttirhni
ce
weentstri7rokvidPd with anvertiCal andn the surface,
motion, but we
could not discover
p esented the appar,tus enr'thqe
rintal ono. M. Leon Foucault,
an authority theajatilte'
tuoors:iaonnsedw
etrlr,
tgheentpleemrsaou who
but could receive no satisfac pzinciples of its cons ruction,
ad-
dressed not being the inventor,
[A-

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