IMPROVEMENTS IN APPARATUS FOR EXTINGUISHING LAMPS
Year: 1867

page_text: LETTERS PATENT to George Tomlinson Bousfield, of Loughborough Park,
Brixton, in the County of Surrey, for the Invention of "IMPROVEMENTS IN
APPARATUS FOR EXTINGUISHING LAMPS." A communication' from abroad by
Nathaniel Mansfield; residing at State Street, Boston, United States of:
America.
Sealed the 17th September, 1867, and dated the 23rd March 1867.
PROVISIONAL SPECIFICATION left by the said George Tomlinson Bousfield'.
at the Office of the Commissioners of Patents, with his Petition, on the
23rd March 1867.-
I, GEORGE' TOMLINSON BOUSFIELD, of Loughborough Park, Brixton, in the
County of Surrey, do hereby declare the nature of the said Invention' for
"IMPROVEMENTS IN APPARATUS FOR EXTINGUISHING LAMPS," to be as follows
This Invention has for its object improvements in apparatus for extinguishing
lamps. For this purpose I arrange a slide on the outside of the wick tube,
and by means of a lever this slide can be worked up and down. There is a
lid or cover jointed to the top of the slide on one side, and when the slide is
raised over the top of the wick tube and wick this cover falls over and closes
the top of the slide, and in this way it extinguishes the flame.

page_text: A convenient arrangement for actuating the slide is to form a stud upon it
which is received into a fork at the end of a lever, and this lever turns on a
pin or fulcrum passing through the frame or gallery. The lever projects a
convenient distance on the outside to be readily acted on by the finger.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said George Tomlinson Bousfield in the Great Seal Patent Office
on the 23rd September 1867.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I,, GEORGE
TOMLINSON BOUSFIELD, of Loughborough. Park, Brixton, in the County of
Surrey, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-third day of March, in the year of our Lord
One thousand eight hundred and sixty-seven, in the thirtieth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me, the
said George Tomlinson Bousfield, Her special licence that I, the said George
Tomlinson Bousfield, my executors, administrators, and assigns, or such others
as I, the said George Tomlinson Bousfield, my 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 "IM-
PROVEMENTS IN APPARATUS FOR EXTINGUISHING LAMPS," a communication to me
from abroad, by Nathaniel Mansfield, a person resident at State Street,
Boston, United States of America, upon the condition (amongst others) that I,
the said George Tomlinson Bousfield, my executors or administrators, by an
instrument in writing under my, 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 imme-
diately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said George Tomlinson Bousfield, do hereby
declare the nature of the said Invention, and in what manner the same is
to be performed, to be particularly described and ascertained in and by the
following statement thereof, that is to say:―
This Invention has for its object improvements in apparatus for extinguishing
lamps. For this purpose I arrange a slide on the outside of the wick tube, and

page_text: by means of a lever this slide can be worked up and down. There is a lid or
cover jointed to the top of the slide on one side, and when the slide is raised
over the top of the wick tube and wick this cover falls over and closes the top
of the slide, and in this way it extinguishes the flame.
A convenient arrangement for actuating the slide is to form a stud upon it,
which is received into a fork at the end of a lever, and this lever turns on a
pin or fulcrum passing through the frame or gallery. The lever, projects a
convenient distance on the outside to be readily acted on by the finger.
The Drawings hereunto annexed show various views of the burner of a lamp
having applied to it an extinguishing apparatus such as is above described.
The burner shown in the Drawing is a burner as is commonly used in lamps
for burning spirit, but similar extinguishing apparatus may be applied to the
burners of other descriptions of lamps.
Figures 1 and 2 of the Drawings shew two vertical sections of the burner
with the extinguishing apparatus in the position into which it is brought when
the lamp is to be lighted; Figure 3 is a vertical section shewing the lid of
the extinguishing apparatus closing over the top of the wick tube; Figure 4
is a plan view of the burner with its cover removed, the extinguishing
apparatus being in the position shewn in Figures 1 and 2.
In these Figures, a is the wick tube, and 6 is a short tube which can be
slid up or down upon it; to one side of the upper edge of the tube 6 is hinged
or jointed a lid c, which when the upper edge of the sliding tube b has been
raised above the wick tube falls over and closes the top of the tube b, and so
closes over the wick tube. The tube b is in the arrangement shewn in the
Drawing raised or lowered on the wick tube by a stud d, on its exterior, being
received between two fingers e¹ formed at one end of a lever e which turns on
a pin f, and which at its other end is formed with a thumb piece or handle e²,
by which the lever can be turned and the tube 6 thus raised or lowered. As
will be seen by the Figures 2 and 4 the thumb piece e³ of the lever e comes
on the exterior of the casing or frame g by which the burner is surrounded;
the thumb piece can thus readily be either raised or lowered. Other arrange-
ments for raising and lowering the slide carrying the lid c may, however, be
adopted. b¹ is a stop on the tube 6 which limits the movement of the lid c, and
stops it from turning back too far. In the arrangement above described the
lid falls over by its own weight when the top of the tube b rises above the wick
tube, but in place of this the lid c may be acted on by a curved finger on the
lever e in such manner that the lid is by this finger turned on its axis, and so
caused to close over the wick tube; when the tube 6 is raised by this arrange-
ment there will be more certainty in the action of the lid or cover c. Such an

page_text: arrangement is shown in the sectional views, Figures 5 and 6: Figure 5 shows
the extinguishing apparatus in the position to which it is brought when the
lamp is to be lighted, and Figure 6 shows the lid of the extinguishing.
apparatus closing over the top of the wick tube; the apparatus shown in these
Figures only differs from the one shown at Figures 1, 2, 3, and 4 in that the
lever e is provided with a third finger e, which when the tube b is raised acts
against a projection c¹ at the back of the lid, and so turn's over the lid and.
causes it to close over the wick tube.
In witness whereof, I, the said George Tomlinson Bousfield, have here-
unto set my hand and seal, this Eighteenth day of September, in the
year of our Lord One thousand eight hundred and sixty-seven.
GEO. T. BOUSFIELD. (L.s.).