IMPROVEMENTS IN LAMPS
Year: 1863

page_text: LETTERS PATENT to Joseph Imbert, Prosper Bonnet, and Jean Pfister,
all of No. 7, Rue Thévenot, Paris, in the Empire of France, Lamp
the Invention of "IMPROVEMENTS IN LAMPS."
Sealed the 12th January 1864, and dated the 3rd August 1863.
PROVISIONAL SPECIFICATION left by the said Joseph Imbert, Prosper
Bonnet, and Jean Pfister at the Office of the Commissioners of Patents,
with their Petition, on the 3rd August 1863.
We, JOSEPH IMDBERT, PROSPER BONNET, and JEAN PFISTER, all of No. 7, Rue
Thévenot, Paris, in the Empire of France, Lamp Manufacturers, do hereby
declare the nature of the said Invention for "IMPROVEMENTS IN LAMPS," to
be as follows:-
Our improvements in lamps consist in a simple contrivance, by means of
which all escape of volatile oils, such as petroleum, is avoided, they consist of
two cylindrical tubes, one within the other, the inner one having a circular
movement, which is communicated to it by means of a small key, which
likewise regulates the wick. Both the tubes are furnished with an orifice of
similar dimensions, by means of which the oil enters the body of the lamp,
when full this orifice is closed by turning round the inner tube by means of
the key till the orifice of the external cylindrical tube is closed by the surface
of the inner one. The receiver, in the centre of which the cylindrical tubes
are placed, is then covered by a top piece, which prevents any emanations
from the gas reaching the body of the lamp, and thus keeps it clean.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Joseph Imbert, Prosper Bonnet, and Jean Pfister, in the
Great Seal Patent Office on the 3rd February 1864.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, JOSEPH
IMBERT, PROSPER BONNET, and JEAN PRISTER, all of No. 7, Rue Thevenot,
Paris, in the Empire of France, Lamp Manufacturers, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Third day of August, in the year of our Lord One
thousand eight hundred and sixty-three, in the twenty-seventh year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto us,
the said Joseph Imbert, Prosper Bonnet, and Jean Pfister, Her special
licence that we, the said: Joseph. Imbert, Prosper Bonnet, and Jean
Pfister, our executors, administrators, and assigns, or such others as
we, the said Joseph Imbert, Prosper Bonnet, and Jean Pfister, our
executors, administrators, and 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 "IMPROVEMENTS. IN LAMPS,"
upon the condition (amongst others) that we, the. said Joseph Imbert,
Prosper Bonnet, and Jean Pfister, our executors or administrators, by an
instrument in writing under our, or their, or one of their hands and seals,
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 calendar months next
and immediately after the date of the said Letters Patent.
NOW KNOW YE, that we, the said Joseph Imbert, Prosper Bonnet, and
Jean Pfister, do hereby declare the nature of our said Invention, and
in what manner the same is to be performed, to be particularly described
and ascertained in and, by the following statement and accompanying
Drawings, that is to say :-
Our Invention relates to improvements in lamps used for burning petrolium,
parafine, and other similar oils, by which all escape of gas is avoided, as by a
very simple arrangement the opening for admitting the liquid into the body of
the lamp can be perfectly closed.
Our Invention will be easily understood by aid of the following description,
due reference being made to the accompanying Drawings, of which Fig. 1
represents the metal top of a lamp, and Fig. 2 an ordinary cap fitting over the

page_text: cup-shaped funnel, by which the liquid enters the lamp, and serving as support
or holder for the glass chimney, the air necessary for combustion is admitted
through small apertures protected from the dust by the overlapping edge a.
The metal top, Fig. 1, consists of an outer and an inner cylindrical tube
A and B, in each of which is a hole C, by which the fluid is admitted into the
body of the lamp. The outer tube A is fixed to the cup-shaped funnel D, and
the inner tube B is movable in a circular direction, and can be turned so as to
shut off the opening C by means of the wick pinion E, which runs through
both tubes, being fixed to the inner one A, and moving in two horizontal
openings of sufficient length to permit the hole of the inner tube B being
turned away from the corresponding hole of the outer tube A, and thus close
the orifice by which the oil or other liquid is introduced. The wick is held in
the burner F, and is raised by the wick pinion E in the ordinary manner.
When the lamp is to be replenished, by moving the pinion E the two
holes C are brought opposite each other, and the liquid is poured into the cup-
shaped funnel D, and so runs into the body of the lamp. When filled, tho
pinion E is turned back, causing the inner tube B to revolve slightly and so
close the opening. The cap, Fig. 2, is then fitted on, which protects the
funnel D from dust, and combined with the mode of closing the orifice C
effectually prevents all smell or escape of gas. The burner or wick holder F,
Fig. 1, opens slightly below the opening c, Fig. 2.
Having thus described our Invention, what we claim, and desire to secure
by Letters Patent as our Invention, is, the peculiar arrangement of lamp top,
as herein-before described and represented in the accompanying Drawings, by
means of which the fluid to be burned is so enclosed as to prevent all smell or
escape of gas or liquid; at the same time we do not confine ourselves to the
precise details, as both shape and dimensions may vary without departing
from the principle of our Invention.
In witness whereof, we, the said Joseph Imbert, Prosper Bonnet, and
Jean Pfister, have hereunto set our hands and seals, this Thirtieth day
of January, in the year of our Lord One thousand eight hundred and
sixty-four
JOSEPH IMBERT.
(L.S.)
PROSPER BONNET. (L.S.)
JEAN PFISTER.
(L.S.)