A Rule and Square for use in Cutting Lantern Slides to Register Correctly.
Year: 1890

page_text: Date of Application, 22nd Dec., 1890
Complete Specification Left, 31st Aug., 1891-Accepted, 3rd Oct., 1891
PROVISIONAL SPECIFICATION.
A Rule and Square for use in Cutting Lantern Slides to Register
Correctly.
DAVID LIONEL SALOMONS, Baronet, of Broomhill in the County of Kent,
do hereby declare the nature of this invention to be as follows:-
A special form of rule or square with a moveable graduated blade to be employed
for cutting the frames of mounted slides to register correctly in multiple lanterns.
The term "register" is well understood to all lanternists and therefore need not be
here defined. When several slides form a set careful registration is needed and no
special tools or means now exist for so doing. Single slides not in sets also require
cutting to register, likewise sets or single slides which are blocked so as to abut
against the lantern stage runners. Other slides abut against the stage stops. The
invention consists of a square, the head being capable of sliding along the blade,
being fitted properly so as to remain a square at all parts of its traverse and
capable of being clamped at any point. Only one face of the blade is to be used,
so both edges are to be bevelled, each bevel edge bearing any scale desired, but
preferably one edge divided into eighths and sixteenths of inches and marked as is
usual with an "eighth scale" and the other edge having an ordinary inch scale
divided into eighths and sixteenths. The zeros of each scale to be placed in a line
with one another at the centre of the length of the blade or at least four inches
from one end, the best length for the blade being 12 inches. The scales will run ou
either side of zero.
To use the square one instance may be given. Suppose the optic axis of the
lantern lens system is made by the adjustment found on well made lanterns to be
3 inches from the stage stop, then all picture slides and others must have their
frames cut so that the centre of the glass slide picture is 3 inches from the end of
the slide which is to abut against the stage stop. Lay the rule down upon the
centre of the slide in the long way of the latter, then by shifting the slide about in
a suitable manner, a position is rapidly found, when the extreme ends of the
picture will indicate similar readings on each side of the zero upon the inch scale.
Now push up the head of the square in contact with the side, on the side away from
the one to be cut. On the inch scale see where 34 inches is in respect to the slide
on the end to be cut (or added to if too short). This will indicate how much wood
or other material must be removed or added to the slide to make it register. All
other dimensions in the other directions of the slide may be similarly adjusted.
Datadh: 051 don of Doomben 1800
H. T. TALLACK,
28, Hatton Garden, London, E.C., Agent for Applicant.
COMPLETE SPECIFICATION.
A Rule and Square for use in Cutting Lantern Slides to Register
Correctly.
I DAVID LIONEL SALOMONS Baronet of Broomhill in the County of Kent,
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 :-
A special form of rule or square with a moveable graduated blade to be employed
for cutting the frames of mounted slides to register correctly in multiple lanterns.
The term "register" is well understood to all lanternists and therefore need not be
ham defined

page_text: When several slides form a set careful registration is needed and no special tools
or means now exist for so doing. Single slides not in sets also require cutting to
register, likewise sets or single slides which are blocked so as to abut against the
lantern stage runners: Other slides abut against the stage stops:
My invention consists of a square the head of which is fitted to slide along the
blade, and remain-at-a right angle at all parts of its traverse. This head is fitted
with any suitable arrangement by means of which it may be clamped in any desired
position.
One face only of the blade is used so both edges may be bevelled, each bevelled
edge having any suitable scale upon it, or one only may be used if desired, but
preferably one edge is divided into eighths and sixteenths of inches and marked as
is usual with an eighth scale, the other edge having an ordinary inch scale divided
into eighths and sixteenths.
The zeros of each scale are placed in a line with one another at the centre of the
length of the blade or at least four inches from one-end,-the-best.length for the
blade being 12 inches.
The scales run on either side of zero and are marked each way from it.
To use the square, one instance may be given. Suppose the optic axis of the
lantern lens system is made by the adjustment found on well made lanterns to be
3 inches from the stage stop, then all picture slides and others must have their
frames cut so that the centre of the glass slide picture is 34 inches from the end of
the slide which is to abut against the stage stop. Lay the rule down upon the
centre of the slide in the long way of the latter, then by shifting the slide about
in a suitable manner a position is rapidly found when the extreme ends of the
picture will indicate similar readings-on cach side of the zero upon the inch
scale. Now push up the head of the square-in-contact-with_the_slide on the side
away from the one to be cut. On the inch scale see where 3 inches is in respect
to the slide on the end to be cut (or added to if too short). This will indicate how
much wood or other material must be removed or added to the slide to make it
register.
All other dimensions in the other directions of the slide may be similarly
adjusted.
In the accompanying drawings,
Fig. 1. represents a plan of complete slide-rule.
A. A. is the blade B the sliding square head and the screw adjustment for
clamping the square head in any desired position on the blade. D. D. and E. E
are the and inch scales respectively, upon the blade A. A., O. O representing the
zeros from which the scales read each way:
Fig. 2 is an end view of Fig. 1. and
Fig. 3 is a section of the centre of the blade A. A with scale enlarged.
Similar letters denote corresponding parts throughout the drawings.
⚫ I do not confine myself to these particular scales as any convenient divisions or
markings may be used and any suitable materials may be used in the construction,
it may also be varied in size to-suit-any-requirements, the size here given being
only one convenient size.
Having now particularly described and ascertained the nature of my said inven
tion and in what manner the same is to be performed, I declare that what I
claim is.
1st. A suitable blade marked with suitable scales having a sliding head with
clamping arrangement for the purposes herein set forth.
2nd. The slide rule or square for cutting lantern slides to register correctly
substantially as herein described and illustrated in the accompanying drawings.
Dated this 31st day of August 1891.
H. T. TALLACK,
28, Hatton Garden, London, E.C., Agent for Applicant.