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 coilodionised plate might be sensi-
tised without touching 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 l'ln-
duqtrie, 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 objec'ive, contrivances
being of course adopted for extending or contracting
the distance. The system rests on a support
provided with means for altering the inclination,
and also for turning the apparatus horizontally so as to
follow the sun. A member of the 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 indistinct or
double ; to which objection M. Liebert replied by produc-
ing a large photograph, about 40 centimetres in height, and
not presenting the slightest defect. This practical illustra-
tion of course silenced opposition for the moment, and a
commission was appointed to examine the system and to
witness its practical working. After this discussion, a he-
liostat was produced, constructed on a principle which the
inventor thought calculated to prevent any error of angles
. receiving the rays of the sun, by means of an excentric
motion, correcting the difference between the angle at the
watt; re ot the earth and that on the surface, The machine
provided with a vertical and an oblique motion, but we
could not discover any Ir)rizlntal one. M. Leon Foucault,
an authority in the matter, questioned the gentleman who
presented the apparatus o
but could receive no satin
the inventor.
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