An Improved Mounting for, and Arrangement of, Lenses for use as a Magnifying Glass or Magic Lantern Objective
Year: 1897

page_text: Date of Application, 31st May., 1897-Accepted, 24th Dec., 1897
COMPLETE SPECIFICATION.
"An Improved Mounting for, and Arrangement of, Lenses for use as
a Magnifying Glass or Magic Lantern Objective."
We, ANTON WAGNER, of 1018 Chestnut Street, Optician, HENRY STOKES
WILLIAMS, NATHANIEL HOWLAND BROWN and MORRIS EARLR, Merchants, of N.E.
Corner 10th & Chestnut Streets, all of Philadelphia, Pennsylvania, United States
of America, do hereby declare the nature of this invention and in what manner
the same is to be performed, to be particularly described and ascertained in and
by the following statement:
This invention relates to the construction of a magnifying glass whereby it gives
high magnifying power, and possesses a field which is sharp, flat and rectilinear
throughout from centre to edge, and at the same time gives fine definition, and is
free from distortion, as will be hereinafter described, the said lens being adjusted
optically for magnifying, or for projection purposes with a lantern, or for engravers
use.
In the accompanying drawing
Figure
the invention.
represents a longitudinal section of a magnifying glass embodying
Figure represents a transverse section of said apparatus.
Similar letters of reference indicate corresponding parts in both the figures.
Referring to the drawings:
A designates a tube or casing, within which and at the ends thereof are the
double convex lenses B, B, and C, C, it being noticed that said lenses are arranged
in pairs, one pair being at each end, the members of each pair being separated by
an intervening ring 1), which is located within the adjacent portion of the casing A,
thus keeping said members a proper distance apart. The outer lens of each pair
is prevented from displacement from the casing by means of the flange or rim E
on the end of the latter, while the inner members of the pairs of lenses are pressed
outwardly by means of one or more coiled or other springs F, which is located
within the casing and bears in opposite directions against the relative lenses thus
firmly holding the lenses and rings in position.
It will be seen that by the present construction, the glass possesses high magni-
fying power, and its field is sharp, perfectly flat and rectilinear, of great brilliancy,
of exquisite definition and free from spherical or chromatic aberration, and cou-
sequently from distortion.
It will also be seen that the device is inexpensive, evon less than that of the
ordinary uncorrected spherical lens.
In order to conveniently apply and remove the lenses, the tube A is divided or
formed into sections constituting the cells of the glass, the same in the present
case having their inner ends formed with flanges & which are engaged by a ring
or collar H or any suitable means, it being evident that when the sections are
separated, access may be had to the interior of the same, and consequently to the
lenses and spring.
The interior wall of said ring or collar is grooved to receive the flanges G,
whereby the cells are firmly held together.

page_text: Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is:―
1st. In a magnifying glass, a pair of double convex lenses at each end of the
casing thereof.
2nd. A casing provided with a pair of double convex lenses at each end thereof,
the members of each pair having between them a ring which separates them, and
means for holding each pair of lenses in position.
3rd. A casing containing one pair of lenses in each end of a tube held in position
by a spiral spring, bearing in opposite directions against the lenses as described.
4th. A casing containing leuses in pairs held apart in operative position in two
cells, and a spiral or other spring, said lenses being adjusted optically for magni-
fying, or for projection purposes with a lantern, or for engravers' use.
5th. The combination of lenses with two cells placed end to end with a spring
for holding said lenses in the cells.
6th. The combination of lenses in pairs the members of each pair being separated
by a ring or cylinder, and two cells placed end to end with a spiral spring between
the inner lenses of the pains.
7th. The combination of lenses in pairs, the lens of each pair being separated
by a ring or other device, and with two cells placed end to end with a spiral spring
and combined with a solid or jointed ring, the inside surface of which is grooved
so as to hold together firmly the two cells containing the lenses and mountings.
Dated the 21+
100%
HASELTINE LAKE & Co
45, Southampton Buildings, London. W.C. Agents for the Applicants.