Lever Box Point Indicator.
Year: 1894

page_text: Date of Application, 26th Feb., 1894
Complete Specification Left, 24th Nov., 1894-Accepted, 29th Dec., 1894
PROVISIONAL DIMITATION
A Lever Box Point Indicator.
1, GUY LIDDELL, Engineer, of 124 Grange Road East, Middlesbro' Yorks, do
hereby declare the nature of this invention to be as follows:-
My invention relates to a construction of indicator for shewing at night the
position of a pair of points. For this purpose, I mount on the frame of the point
lever box a lantern with lenses directing light both ways, and on the lever itself
I fix a pair of coloured glasses so arranged that, when the lever is over in its one
position, the light of the lantern shines through the one glass, shewing colour in the
one direction of the line, but no colour in the other. And when the lever is moved
over altering the points, the other coloured glass transmits. the coloured light in.
the opposite direction of the line. Instead of fixing the coloured glasses on the
lever, they may be fixed on a slide or moving part connected to the lever so that,
according as the lever is moved to the one attitude or the other, the coloured glass
is brought in front of the lantern lens on the one side or the other.
There may be on each side of the lantern, glasses of two different colours such
as red and green inverted so that, when the lever is in one of its two positions, red
is seen on the one side of the lantern and green on the other, and when the lever is
moved to its other position the colours on each side are reversed.
Dated this 26th day of February 1894.
ABEL & IMRAY,
Agents for the Applicant.
I, GUY LIDDELL, Engineer, of 124 Grange Road East, Middlesbro' Yorks, 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 :-
My invention relates to a construction of indicator for showing at night the
position of a pair of points. For this purpose, as shewn in the side elevation Fig. 1
of the accompanying drawings, I mount on the frame of the point lever box, a
lantern A with lenses at B and C directing light both ways, and on the lever itself
1 fix a pair of coloured glasses D and E so arranged that when the lever is over
in its one position, for instance to the right, the light of the lantern shines through
the one lens at C and glass E, shewing colour in the one direction of the line, while
no colour is shewn in the other direction. And when the lever is moved over
altering the points, the other coloured glass D transmits the coloured light from B
in the opposite direction of the line.
The arrangement above described is suitable for levers that are moved in a plane
parallel with the line. When the lever is moved in a plane at right angles to the
line, then, instead of fixing the coloured glasses on the lever itself, they may be
fixed on a slide or moving part connected to the lever as shewn in elevation in
Fig. 2, so that according as the lever is moved to the one attitude or the other

page_text: the coloured glass is brought in front of the lantern lens on either side or on both
:sides.
3-
Thus there may be fixed on a slide F, linked to the lever on each side of the
lantern A, glasses D and E of two different colours, such as red and green,
inverted, so that, when the lever is in one of its two positions, red is seen on the
one side of the lantern and green on the other, and when the lever is moved to its
other position the colours on each side are reversed.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. A lever box point indicator substantially as described with reference to Fig. 1
of the drawings.
2. The modified form of point indicator, substantially as described with reference
to Fig. 2.
Dated this 24th day of November 1894.
ABEL & IMRAY,
Agents for the Applicant.