Improvements in Lanterns for Scientific Purposes.
Year: 1898

page_text: Date of Application, 26th Aug., 1898-Accepted, 5th Nov., 1898
COMPLETE SPECIFICATION.
Improvements in Lanterns for Scientific Purposes.
We, HERBERT CHARLES NEWTON, Scientific Instrument Maker, of 3, Fleet
Street, in the City of London, and FREDERIC EUGENE IVES, Gentleman, af 121,
Shaftesbury Avenue, in the County of London, 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:
The object of this invention is to render a single lantern suitable for use as a
microscope, a spectrum, an ordinary, or a kinematograph lantern, as desired, and
the invention consists in the mode of adapting thereto a detachable front,"
carrying the various lenses and other appliances, and also in certain details of
construction which will be more particularly referred to hereafter.
In the accompanying drawings,
Fig. 1 is a side elevation of our improved lantern.
Fig. 2 is a plan view of the same.
Fig. 3 is a back view of the front.
Fig. 4 is a plan view of a removable block, intended to carry the front, and,
Fig. 5 is a plan view of the base of the lantern.
A is the lantern, which is fixed at one end of a base plate B. In the side doors
of the lantern are coloured glass peep-holes A', which may be covered by sliding
shutters. C is the condenser, of suitable character, which may be so arranged
that part of it may be removed for certain objects, and C₁ are spring holders for
the slide or the object, and which are pivotted to the body of the lantern, so that
they may be swung aside, to permit of taking out part of condenser when
required.
D is a frame, which is pivotted at the sides of the lantern, as shown, and carries
a curtain D, to prevent the glare of the light inconveniencing the audience,
and D2 is a flat cover, which is hinged to the back of the lantern, and, when the
curtain is in position, closes in the opening at the top.
By pivotting the frame D in advance of the hinge of the cover D², as shown,
the cover will be able to pass down through the frame when the latter is reversed,
or turned to the front, for packing, purposes, and the cover will then lie flat
against the back of the lantern for the same purpose.
Across the base B, in front of the lantern A, are fixed bars E, E1, E2, (see Fig. 5),
which serve as tracks or guides on which a removable block G rests.
The bar E has two pins, E*, which enter corresponding holes in the underside
of the block G. The bar E' serves as a guide bar, and between it and the bar E²,
which is undercut in any convenient manner on its front edge, fits the bar Gon
the underside of the block G. This bar G₁ is arranged to fit under the bar E²,
so that with the bar E¹ and the pins E*, the block is securely held in position,
but at the same time is readily detachable, in case of need.
On the top face of the block G, bars H, H1, H2, are secured, which serve the
same purposes as the bars E, E, E³, the bar H² being undercut, or overhanging,
as may be preferred.
Between the bars H1, H2, fits a bar J, secured to the underside of the front K,
and extending slightly beyond its rear edge, as shown in Fios 1 and 2

page_text: The front is thus held securely in position, though it is capable of sliding back-
wards and forwards across the block G.
To arrest the sliding movement at the end of its travel in either direction, a
stop J is provided on the block G, and stops J, J, are attached to the underside
of the front K. To arrest the front K in a central position, a spring stop Ja is
attached to the underside of the front, and this spring stop takes into a recess G2
formed in the block G.
The front" K consists of the block, K, of suitable length and width, with a
side wall K and two end walls K2. To the side wall K' are attached, in any con-
venient manner, the several lenses X, Y, Z, serving for the microscope, the
ordinary, or the spectrum lantern.
L is a mirror pivotted to the base block K, the use of which will be presently
explained.
M is a screen which is secured to the back of the block K and one end wall K².
It is provided with a slit M' and a hole M2, and behind the latter is a comparison
prism N, for absorption spectra.
The slit M is arranged on the centre line or axis of the spectrum lens and of
the condenser C, and the light passes thro' this slit on its way to the lens.
When the front is pushed over to the position shown in the drawing, Fig. 2, the
spectrum lantern is being worked, and in order to make a comparison, the mirror
is turned to the position shown. A portion of the light then passes through the
prism N; is cast onto the mirror; and is thereby deffected to the ordinary lens Y,
so that the colour being employed may be shown on a corner of the sheet, for
comparison.
When the ordinary lantern is required, or when it is not desired to compare,
the mirror will be turned to the opposite side, out of the way, and it will then be
ineffective.
When adapting a kinematograph to the lantern, the front K and the block G
will both be removed, and the kinematograph will be placed on the base B.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is:-
:-
1. A "front" for scientific lantern constructed, arranged, and operating as
herein shown and described.
2. The adaptation to a scientific lantern, of a removable "front," as and for the
purpose set forth.
3. Carrying a removable "front" for a scientific lantern on a removable block,
as herein shown and described.
"
"
4. In a front for a scientific lantern, the combination of a spectrum lens, an
ordinary lens, a comparison prism, and an adjustable mirror, as herein shown and
described, and for the purpose set forth.
5. In a scientific lantern, the combination of a removable "front," a removable
block, and a condenser, so formed that part of it may be readily removed to adapt
the lantern for use with a kinematograph, as herein shown and described.
6. In a scientific lantern, the arrangement of curtain frame and hinged cover,
as herein shown and described, and for the purpose set forth.
7. A scientific lantern constructed, arranged, and operated as herein shown and
described.
Dated this ofth
J
A
1000