IMPROVEMENTS IN LAMPS."
Year: 1866

page_text: LETTERS PATENT to John Jackson, of Belmont Works, Battersea, in the
County of Surrey, for the Invention of "IMPROVEMENTS IN LAMPS."
PROVISIONAL SPECIFICATION left by the said John Jackson at the
Office of the Commissioners of Patents, with his Petition, on the 30th
June 1866.
I, JOHN JACKSON, of Belmont Works, Battersea, in the County of Surrey,
do hereby declare the nature of the said Invention for "IMPROVEMENTS IN
LAMPS," to be as follows:-
This Invention has for its object improvements in lamps. Heretofore
when attempts have been made to burn petroleum oil in moderator lamps
it has been found that the ordinary form or constructions of pistons used
in such lamps become quickly injured by the action of that oil on the materials.
of which the principal parts of such pistons are composed.
This Invention consists in forming the pistons of moderator lamps suitable
for burning petroleum oil in such manner that the circumference of each
piston may be packed by cotton or other suitable yarn or material in. such
manner that the oil may not pass between the periphery and the cylindrical
oil vessel in which it works; through this piston is formed a passage which
is closed by a valve of metal or other material which is not acted on by

page_text: petroleum oil; this valve is arranged to open downwards, so that when the
piston is raised by the ordinary gearing the valve will open and allow the
petroleum oil to pass through the piston, and such valve will close and will
remain closed during the descent of the piston. The means of conducting the
oil up to the burner and for applying and moving the wick are of the ordinary
construction.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said John Jackson in the Great Seal Patent Office on the
28th December 1866.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN
JACKSON, of Belmont Works, Battersea, in the County of Surrey, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Thirtieth day of June, in the year of our Lord
One thousand eight hundred and sixty-six, in the thirtieth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me,
the said John Jackson, Her special licence that I, the said John Jackson,
my executors, administrators, and assigns, or such others as I, the said
John Jackson, my executors, administrators, and assigns, should at any
time agree with, and no others, from time to time and at all times there-
after 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 "IMPROVE-
MENTS IN LAMPS," upon the condition (amongst others) that I, the said John
Jackson, 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 immediately after the date of the
said Letters Patent.
NOW KNOW YE, that I, the said John Jackson, 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 follow-
ing statement thereof, that is to say :-
This Invention has for its object improvements in lamps. Heretofore.
when attempts have been made to burn petroleum oil in lamps wherein the

page_text: fluid is raised to the wick by pistons, as in moderator lamps, it has been
found that the ordinary form or constructions of pistons used in such
lamps become quickly injured by the action of that oil on the materials of
which the principal parts of such pistons are composed.
This Invention consists in forming the pistons of moderator lamps suitable
for burning petroleum oil in such manner that the circumference of each
piston may be packed by cotton or other suitable yarn or material in such
manner that the oil may not, as has heretofore been the case, pass between the
periphery and the cylindrical oil vessel in which it works.
The piston according to the present Invention is to be formed as
nearly as may be to fit the cylindrical oil vessel, and in place of having a
cupped packing of leather or of other suitable material, as heretofore practised,
the piston is to be simply packed by winding round the same cotton yarn or
other suitable material so that the packing will prevent the oil passing between
the packing and the vessel; through this piston is formed a passage which
is closed by a valve of metal or other material which is not acted on by
petroleum oil; this valve is arranged to open downwards, so that when the
piston is raised by the ordinary gearing the valve will open and allow the
petroleum oil to pass through the piston, and such valve will close and will
remain closed during the descent of the piston. The valve may be formed to
open on a hinge or be on a spindle as is well understood in forming valves for
other purposes, and when the form and arrangement of the valve is such as to
require it a light spring may be employed to act thereon with a tendency to
keep the same shut. The piston is as beretofore constantly pressed down-
wards by a strong spring in order to force the oil up to the burner. The
means of conducting the oil up to the burner and for applying and moving the
wick are of the ordinary construction.
In witness whereof, I, the said John Jackson, have hereunto set my
hand and seal, this Twentieth day of December, in the year of our
Lord One thousand eight hundred and sixty-six.
Witness,
HY. N. BLAKE,
Belmont Works,
Battersea.
JOHN JACKSON. (L.S.)