IMPROVEMENTS IN RAILWAY AND OTHER LAMPS
Year: 1876

page_text: LETTERS PATENT to Charles John Davis and John Thomas Cooper Thomas, both
of Whitefriars Street, Fleet Street, for the Invention of "IMPROVEMENTS IN
RAILWAY AND OTHER LAMPS."
aled the 30th September 1876, and dated the 28th April 187
PROVISIONAL SPECIFICATION left by the said Charles John Davis and John
Thomas Cooper Thomas at the Office of the Commissioners of Patents on the
28th April 1876.
CHARLES JOHN DAVIS and JOHN THOMAS COOPER THOMAS, both of Whitefriars
Street, Fleet Street. "IMPROVEMENTS IN RAILWAY AND OTHER LAMPS."
The object of this Invention is to afford greater illuminating power than has
hitherto been obtained. For this purpose we proceed as follows:-Over the
ordinary argand burner we place a movable cap or cone having perforations around
its sides and an orifice at the top. Such orifice is furnished with a lip or rim to
receive a glass chimney about 2 ins. in height. On the top of such chimney we
place a tin or other metal funnel or tube of a suitable diameter to fit cleanly over
the top of the glass chimney. Such tube or funnel has an orifice formed in its
top of a similar shape, and nearly corresponding in size to the orifice formed in the
cone or cap, as before described, and this tube or funnel is kept in position by
metal stays or arms fastened in any suitable manner to the ordinary metal reflector,
such reflector having a suitable orifice in its centre to receive the glass chimney
before described. At the top of the lantern we fix a metal cone open at the top,
and over this cone we place a metal cap having either a domed or square top.
About midway in the inside of this cap we place a suitable metal lining formed in
the shape of alcone, and of suitable size to permit of its passing a little way over
the top of the 'cone just described, such metal lining is held in position inside the
cap by means of suitable metal stays or supports. Around the top of the metal
cap a suitable opening or openings are formed to permit of the escape of the heat.
The increased illuminating power is derived from the reflection of the light on the
sides of the tin funnel or tube placed on the glass chimney as before described.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Charles John Davis and, John Thomas Cooper Thomas in the Great
Seal Patent Office on the 12th October 1876.
CHARLES JOHN DAVIS and JOHN THOMAS COOPER THOMAS, both of Whitefriars
Street, Fleet Street. "IMPROVEMENTS IN RAILWAY AND OTHER LAMPS."
The object of this Invention is to construct a railway or other similar lamps in
such a manner that it affords greater illuminating power than has hitherto been
obtained, and we will now with the aid of the accompanying Drawing (which shews
a sectional elevation of a railway lamp) proceed more particularly to describe the
nature of our said Invention, and the manner of carrying the same into operation.
For this purpose we proceed as follows:-Over the ordinary argand burner we
place a movable metal cap or cone a, a, having perforations b around its sides and an
orifice at the top. Such orifice c is furnished with a lip or rim d, d, to receive a
glass chimney e of any suitable dimensions, say about two inches in height. On the
top of such chimney e we place a tin or other metal funnel for tube of a suitable
diameter to fit cleanly over the top of the glass chimney e. Such tube or funnel f
has an orifice g formed in its top of a similar shape and nearly corresponding in size
to the orifice formed in the cone or cap a as before described, and this tube or
funnel is kept in position by metal stays or arms h, h, fastened in any suitable
manner to the ordinary metal reflector, which has, a suitable orifice in its centre
to receive the glass chimney e before described. At the top of the lantern we fix a
metal cone having an opening j at the top, and over this cone we place a metal
cap having either a domed or square top. About midway in the inside of this
cap we place a suitable metal lining 1, l, formed in the shape of a cone, and of a
suitable size to permit of its passing a little way over the top of the cone i just
described. Such metal lining 1, l, is held in position inside the cap by means of
suitable metal stays or supports m. Around the top of the metal cap a suitable
opening or openings n, m, are formed to admit of the escape of the heat.
increased illuminating power is derived from the reflection of the light on the
sides of the tin funnel for tube placed on the glass chimney e as before described.
The other parts shewn on the Drawing are not new, and therefore need no
description.
The
Having now particularly described and ascertained the nature of our said
Invention and the manner of carrying the same into operation, we would have it
understood that what we claim and desire to secure by the herein-before in part
recited Letters Patent are the improvements in railway and other lamps, substantially
in the manner and for the purposes herein-before set forth and described.
In witness whereof, we, the said Charles John Davis and John Thomas Cooper
Thomas, have hereunto set our hands and seals, this Ninth day October,
in the year of our Lord One thousand eight hundred and seventy-six.