AN IMPROVEMENT IN LAMPS
Year: 1873

page_text: LETTERS PATENT to William Harvie, of Glasgow, in the County of
Lanark, North Britain, for the Invention of "AN IMPROVEMENT IN
LAMPS."
Scaled the 17th October 1873, and dated the 18th April 1873.
PROVISIONAL SPECIFICATION left by the said William Harvie at
the Office of the Commissioners of Patents, with his Petition, on
the 18th April 1873.
I, WILLIAM HARVIE, of Glasgow, in the County of Lanark, North
3 Britain, do hereby declare the nature of the said Invention of "AN
IMPROVEMENT IN LAMPS," to be as follows, that is to say :-
This Invention relates to an improvement in lamps wherein oil is
burned, and in which a flat wick is used, and it is applicable to ships'
lamps, cabin lamps, railway station, signal, and train lamps, as well as
O lamps used for other purposes.
The Invention consists in placing a raised or flat cap or disc having an
opening or hole at the centre corresponding with the shape of the wick,

page_text: but which is larger than a section of the wick, at the bottom of the lamp
globe or chimney. This cap may be constructed cither of metal or glass,
preferably pressed in a mould to the required shape. By means of this
cap'an air current is caused to impinge upon the flame of the lamp.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said William Harvie in the Great Seal Patent Office,
on the 18th October 1873.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
HARVIE, of Glasgow, in the County of Lanark, North Britain, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Eighteenth day of April, in the year
of our Lord One thousand eight hundred and seventy-three, in the
36th year of Her reign, did, for Herself, Her heirs and successors, give
and grant unto me, the said William Harvie, Her special license that
I, the said William Harvic, my exccutors, administrators, and assigns,
or such others as I, the said William Harvie, my executors, adminis-
trators, or assigns, should at any time agree with and no others,
from time to time and at all times thereafter during the term therein
expressed, should and lawfully might make, use, exercise, and vend,
within the United Kingdom of Great Britain and Ireland, the Channel
Islands, and Isle of Man, an Invention for "AN IMPROVEMENT IN LAMPS,"
upon the condition (amongst others) that I, the said William Harvic,
by an instrument in writing under my hand and seal, should particularly
describe and ascertain the nature of the said Invention, and in what
manner the same was to be performed, and cause the same to be filed
in the Great Seal Patent Office within six calender months next and
immediately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said William Harvie, 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, reference being had to the accompanying Drawings,
and to the letters and figures marked thereon, that is to say:-
My said Invention relates to an improvement in lamps wherein oil is

page_text: burned, and in which a flat wick is used, and it is applicable to ships'
lamps, cabin lamps, railway station, signal, and train lamps, as well as
lamps used for other purposes.
My Invention consists of a raised or flat cap or disc, having a hole or
opening at the centre, placed at the bottom of the lamp globe or
chimney, and by means of which cap or disc an air current is caused to
impinge upon the flame of the lamp.
And in order that my said Invention may be properly understood I
now proceed more particularly to set forth the system, mode, or manner
in or under which the same is or may be used or practically carried
into effect, that is to say :-
On the Sheet of Drawings hereunto appended Figure 1 is a side
clevation of a lamp shewing in vertical section the improvement which
constitutes my said Invention applied thereto, and which consists in
placing a curved or raised disc or cap A at the bottom of the lamp globe
or chimney B.
The disc or cap A, placed at the bottom of the lamp globe or chimney
B, is supported on the rest or holder C, which also supports the globe
or chimney B, and it is formed with an opening or hole D at the
centre corresponding somewhat to the shape of the wick, but which
is larger than a section of the wick, as seen more particularly on
the detailed plan of the disc or cap A, at Figure 2.
Holes or per-
forations E are or may be formed at each side of the hole or
opening D, as shewn; and through the said hole or opening D and holes
E air currents pass upwards in the direction of the arrows shown at
Figure 1, and impinge upon the flame of the lamp, whereby the
illuminating power of the flame is increased. The disc or cap A may
be constructed of metal or glass, preferably pressed in a mould to the
required shape, and a notch F is made in the periphery thereof, into
which one of the arms or other projection formed on the holder Centers,
and retains the disc or cap in position.
In lieu of forming the disc or cap A curved as shewn, it may, if
desired, be made flat; and instead of constructing the said disc or cap
separately, as herein-before described and shown at Figures 1 and 2, it
may be made in one piece with the globe or chimney, as shown in
vertical section at Figure 3, and in plan at Figure 4 of the Drawings.
Under this arrangement a notch a, Figure 4, is formed at the lower part

page_text: of the chimney or globe, into which a projection on the holder enters
and retains the globe or chimney in position.
Instead of making the globe or chimney, constructed as last set forth,
circular in plan, it may be made oval or elliptical, as shewn at Figure 5.
Having now described and particularly ascertained the nature of my
said Invention, and the system, mode, or manner in or under which the
same is or may be used or practically carried into effect, I would observe
in conclusion that what I consider to be novel and original, and there-
fore claim as the Invention secured to me by the herein-before in part
recited Letters Patent is, the cap or disc applied under either of the
modes shewn on the annexed Drawings at the bottoms of lamp globes
or chimneys, as and for the purpose herein-before set forth.
In witness whereof, I, the said William Harvie, have hereunto set
my hand and seal, this Seventeenth day of October One thousand
eight hundred and seventy-three.