Improvements in Lamps.
Year: 1892

page_text: Date of Application, 19th May, 1892
Complete Specification Left, 12th July, 1892-Accepted, 13th Aug., 1892
PROVISIONAL SPECIFICATION.
Improvements in Lamps.
I, WALTER HENRY BULPITT, of the firm of Bulpitt & Sons of 155 Camden
Street, Birmingham, in the County of Warwick, Tin Plate Worker, do hereby
declare the nature of my said invention to be as follows :-
My invention has for its object improvements in lamps which are applicable to
many kinds of lamps such for instance as policemen's lamps, railway lamps, tracing
The
lamps and to square oblong round or other shaped lamps or lanterns.
particular object in view is to improve the ventilation and to keep the lamp cooler
and to operate the dark and color slides more perfectly. I will explain the
invention as applied to an ordinary policeman's lamp :-
I construct the door or front near the glass with an outer and inner thickness so
that a current of air can enter by the bottom of the slit and rise upwards to the
top thus keeping it cool and also lending a supply to the burner. In this slit I
mount my dark or colored slide or slides as the case may be and operate it by a
hook or knob or other projection or part from the top or bottom. To make the
slide work steadily I mount one two or more springs to bear against one face
thereof which are quite effective for the purpose. By this means there is no
necessity to touch the top of the lamp when hot as they frequently are.
Dated this 18th day of May 1800
GEORGE BARKER,
77, Colmore Row, Birmingham, Agent.
COMPLETE SPECIFICATION.
Improvements in Lamps.
I, WALTER HENRY BULPITT, of the firm of Bulpitt & Sons of 155 Camden
Street, Birmingham, in the County of Warwick, Tin Plate Worker, do hereby
declare the nature of my said 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 has for its object improvements in lamps which are applicable to
many kinds of lamps such for instance as policemen's lamps railway lamps, tracing
lamps and to square oblong round or other shaped lamps or lanterns. The
particular object in view is to improve the ventilation and to keep the lamp cooler
and to operate the dark and color slides more perfectly. I will explain the
invention as applied to an ordinary policeman's lamp
I construct the door or front near the glass with an outer and inner thickness so
that a current of air can enter by the bottom of the slit and rise upwards to the
top thus keeping it cool and also lending a supply to the burner. In this slit I
mount my dark or colored slide or slides as the case may be and operate it by a
To make the
hook or knob or other projection or part from the top or bottom.
slide work steadily I mount two or more springs to bear against one face thereof
which are quite effective for the purpose. By this means there is no necessity to
touch the top of the lamp when hot as they frequently are.
In order that my invention may be clearly understood and more easily carried
into practice I have appended hereunto two double sized sheets of drawings upon
which I have fully illustrated the nature of my said improvements.
Figure 1, is a front view of an ordinary policeman's lantern.
Figure 2, is a longitudinal vertical section through Figure 1.

page_text: Figure 3, 18 a sectional plan on the line 1-2. of Fig. 1.
Figure 4, is a plan of the top of the lantern.
Figure 5, is a front elevation off a signal hand lamp.
Figure 6, is a part vertical section through Figure 5.
Figure 7, is a front view of the signal hand lamp reflector.
In carrying my invention into effect I construct the door or front in which the
lens is fixed with the outer thickness of metal B and the inner thickness & so that
a current of air can enter at the bottom as shown by the arrow W and rise
upwards to the top thus keeping it cool preventing the lens from steaming and
lending a supply of air to the burner.. In this slit the dark slide E. is mounted to
slide up and down between the light and the lens F being operated by the hook,
knob, or other projection e³. To make the slide E work steadily I mount two or
more springs as shown at Figures 3 and 8 which bear against one face of the
slide E and thus prevent it from slipping. Above the slide and attached to the
top of the lamp I provide the projections and 2 which prevents the slide E from
being drawn too far out when the door is closed but being attached to the top of
the lamp the slide may be readily withdrawn entirely from the door B when the
door is open. The slot 62 is provided in the front of the door B to allow the
projecting hook to rise or fall with the slide.
In applying my invention to hand signal and other such lamps I mount two
slides E and E2 Sheet 2 in between the front and back linings B and b and I
place an intermediate partition between the two slides. One slide contains green
glass and the other red while in case of both being down together they form a
combination sufficiently opaque to form a dark slide and thus shut off all light
from the lens. The current of air passes up and keeps the lens and glasses cool as
in the case of the policeman's lamp. In applying my improvement to hand signal
lamps I diffuse the light through the lens towards the ground by means of the
reflector R which is shaped at to have this effect and is provided with the
chimney to steady the light while the lamp is being swung in the hand.
By these means there is no necessity for touching the top a' of the lamp when
hot for the purpose of altering or shutting off the light.
Similar means are taken in the case of the hand signal lamp to that of the
policeman's lantern for preventing the slides being drawn too forward.
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 P
claim is :-
The improvements in lamps consisting of a slide or slides E and E' mounted and
operated substantially such as and for the purpose herein set forth & shewn upon
the accompanying two sheets of drawings.
Dated this 8th day of July 1892.
GEORGE BARKER,
77, Colmore Row, Birmingham, Agent.