Improvements in Lenses.
Year: 1895

page_text: Date of Application, 14th May, 1895-Accepted, 15th June, 1835
COMPLETE SPECIFICATION.
Improvements in Lenses.
A communication by HENRY H. TURNER and JOHN C. REICH, both of
Rochester, in the State of New York, United States of America,
Manufacturers.
1, WILLIAM PHILLIPS THOMPSON F.C.S., M.I.M.E. of The Agency for
Foreign Patent Solicitors, 0 Lord Street, Liverpool, and 6 Bank Street,
Manchester both in the County of Lancaster, 118 New Street Birmingham in
the County of Warwick and 31 High Holborn in the County of Middlesex, Civil
Engineer do hereby declare the nature of this invention and in what monuer 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 an improved lens, designed
principally for use in photography. The improved lens is fully described and
illustrated in the following Specification and the accompanying drawings, the
novel features thereof being specified in the claims annexed to the said
Specification.
In the accompanying drawings :
Figure 1 is a central longitudinal section.
In this invention five lenses are combined together so as to produce a compound
Jens practically free from chromatic, spherical and astigmatic aberration. The
quintuplo lens thus formed is capable of being used singly for photographio
work, or two such lenses may be combined to form a double objective, as indicated
at L, L, Figure 1.
In the accompanying drawings are represented a compound lens embodying
the improvements, in which the separate lenses are described in the following
table:-
In diameter 13 5830 mm., distance from outside to outside of the double
objective 49 20, and equivalent focus 279-40. The lenses are cemented together in
the usual manner.
Lenses constructed substantially in accordance with the foregoing data will be
found to be practically free from the defects mentioned.
C and D are the collecting lenses and A B E the dispersing lenses. The
construction admits of much latitude in the details of the various lenses, and also
In the relative arrangement of the same. The skilful optician will be able to
produce a perfectly corrected lens by following the instructions herein given, and
will also understand how to vary the details in adapting the improvements to
larger or smaller objectives.

page_text: Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed as communicated to me by
my foreign correspondents I declare that what I claim is:
1. The herein described compound lens consisting of the lenses A B C DE,
having the curvatures and refractive indices, substantially as herein set forth.
2. The herein described quintuple compound lens consisting of two collecting
and three dispersing lenses, substantially as and for the purposes set forth.
3. The herein described quintuple compound lons, consisting of the outor
convexo-concave crown-glass lens A, the convexo-concave flint-glass lens B, and
the crown-glass lenses CD E, substantially as described.
4. The herein described quintuple compound lens consisting of the crown-glass
collecting lenses C and D, having crown-glass dispersing lens E on one side and
the flint and crown dispersing lenses B and A ou the other side, substantially as
described.
Datel this 13th day of Mar 1895
WM. P. THOMPSON & Co.,
Agents.