IMPROVEMENTS IN SPECTACLES, EYE GLASSES, AND OTHER SIMILAR ARTICLES
Year: 1871

page_text: LETTERS PATENT to John Henry Johnson, of 47, Lincoln's Inn
Fields, in the County of Middlesex, Gentleman, for the Invention
68
of "IMPROVEMENTS IN SPECTACLES, EYE GLASSES, AND OTHER SIMILAR
ARTICLES." A communication from abroad by Eloi Eugène Narcisse
Derogy, of Paris, France.
Scaled the 22nd December 1871, and dated the 14th July 1871.
PROVISIONAL SPECIFICATION left by the said John Henry Johnson
at the Office of the Commissioners of Patents, with his Petition,
f
on the 14th July 1871.
I, JOHN HENRY JOHNSON, of 47, Lincoln's Inn Fields, in the County
of Middlesex, Gentleman, do hereby declare the nature of the said
Invention for "IMPROVEMENTS IN SPECTACLES, EYE GLASSES, AND OTHER SIMILAR
ARTICLES," a communication to me from abroad by Eloi Eugene Narcisse
Derogy, of Paris, France, to be as follows:-
This Invention consists in a method of fixing the glasses in spectacles
and eye glasses and such like articles, by means of which the achromatic.
glasses employed in optical instruments, such as telescopes, opera glasses,

page_text: and microscopes, may be used for spectacles, eye glasses, and similar
articles. Achromatic glasses present great advantages over the others as
regards clearness and preservation of the sight, but there has hitherto
been a difficulty in employing them for spectacles and eye glasses as
being formed of several lenzes of different densities connected together by
means of transparent cement, the slighest shock or jar in the direction
of the join would tend to detach them from each other. To obviate this
it is proposed to form the glasses with a groove on the periphery or
inner edge for the reception of a small band of india-rubber which is
thus introduced between the glass and the frame. The rings in which
the glasses are mounted are constructed with small bow springs at their
upper and lower parts, which springs serve to compress the india-rubber
band and hold the glasses firmly in the frame.,
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said John Henry Johnson in the Great Seal Patent
Office on the 11th January 1872.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN
HENRY JOHNSON, of 47, Lincoln's Inn Fields, in the County of Mid-
dlesex, Gentleman, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Fourteenth day of July, in the year
of our Lord One thousand eight hundred and seventy-one, in the
35th year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said John Henry Johnson, Her special
license that I, the said John Henry Johnson, my executors, admi-
nistrators, and assigns, or such others as I, the said John Henry
Johnson, my executors, administrators, or assigns, should at any time
agree with, and no others, from time to time and at all times thereafter
during the term therein expressed, should and lawfully might make,
use, exercise, and vend, within the United Kingdom of Great Britain
and Ireland, the Channel Islands, and Isle of Man, an Invention for
"IMPROVEMENTS IN SPECTACLES, EYE GLASSES, AND OTHER SIMILAR ARTICLES," a
communication to me from abroad by Eloi Eugene Narcisse Derogy, of
Paris, France, upon the condition (amongst others) that I, the said
John Henry Johnson, my executors or administrators, by an instrument
in writing under my hand and scal, should particularly describe and

page_text: ascertain the nature of the said Invention, and in what manner the
same was to be performed, and cause the same to be filed in the Great
Scal Patent Office within six calendar months next and immediately
after the date of the said Letters Patent.
f
NOW KNOW YE, that I, the said John Henry Johnson, do hereby
declare the nature of the said Invention, and in what manner the same
is to be performed, to be particularly described and ascertained in and
by the following statement, reference being had to the accompanying
Drawings, and to the letters and figures marked thereon, that is to
say: -
The said Invention consists in a method of fixing glasses in spectacles,
eye glasses, and such like articles whereby the achromatic glasses
employed in optical instruments, such as telescopes, opera glasses, and
microscopes may be used for spectacles, eye glasses, and similar articles.
It is well known that achromatic glasses offer great advantages over the
others as regards clearness and preservation of the sight, but there has
hitherto existed a difficulty in employing them for spectacles and eye
glasses, as being formed of two or more glasses of different densities
connected together by means of transparent cement, the slightest shock
or jar in the direction of the join would tend to detach them from cach
other. To obviate this it is proposed to form achromatic glasses for
spectacles, and double or single eye glasses with a groove on the
periphery or inner edge of the glasses for the reception of a small band
of india-rubber, which is thus introduced between the glass and the
frame or mount. The frames in which the glasses are mounted are
constructed with small bow springs at their upper and lower parts corre-
sponding to the minor axis of the ellipse, which springs serve to
compress the india-rubber band and hold the glasses firmly in the frame.
In the accompanying Drawing Figure 1 is a plan, and Figure 2a
front elevation of a pair of spectacles constructed according to this
Invention; Figure 3 is an enlarged vertical section of one of the
achromatic glasses taken through the frame or mount in the direction
of the minor axis of the ellipse or along the dotted lines 1-2,
(Figure 2).
In these Figures A, A, are the achromatic lenses, round the edges of
which at their junction there is formed a groove for the reception of the
band of caoutchouc; bc is the frame or mount, in which there is formed
opposite each end of the minor axis of cach glass a bow or curve d

page_text: forming a spring, as shewn more clearly in Figure 2. This part d may
either be affixed to the frame or form one picce therewith.
Having now described and particularly ascertained the nature of the
said Invention, and the manner in which the same is or may be used or
carried into effect, I would observe in conclusion that what I consider
to be novel and original, and therefore claim as the Invention secureḍ
to me by the herein-before in part recited Letters Patent is,―
First. The application and use to and in spectacles and double or
single eye glasses of achromatic glasses or lenses, substantially as hercin-
before described.
.
Second. The peculiar mode of or means for fitting or securing
achromatic glasses into the frames of spectacles and double and single
eye glasses, as and for the purpose herein-before described.
In witness whereof, I, the said John Henry Johnson, have to this
my Specification set my hand and seal, the Eleventh day of
January One thousand eight hundred and seventy-two.
J. HENRY JOHNSON. (L.S.)