IMPROVEMENTS IN THE VALVES OF PRESSURE LAMPS, AND IN LAMP BURNERS."
Year: 1853

page_text: LETTERS PATENT to John Thomas Stroud, of Birmingham, in the
County of Warwick, for the Invention of "IMPROVEMENTS IN THE
VALVES OF PRESSURE LAMPS, AND IN LAMP BURNERS."
PROVISIONAL SPECIFICATION left by the said John Thomas
Stroud at the Office of the Commissioners of Patents, with his
Petition, on the 6th May 1853.
I, JOHN THOMAS STROUD, of Birmingham, in the County of War-
wick, do hereby declare the nature of my said Invention for "IMPROVE-
MENTS IN THE VALVES OF PRESSURE LAMPS, AND IN LAMP BURNERS,"
to be as follows (that is to say):
My improvements in the valves for pressure lamps consist in making
them of an angular form, which enables me to make the stands for
such lamps of a much more preferable shape than heretofore in use;
and my Improvements in lamp burners consist in so constructing
them that the wick or lamp cotton may be raised or lowered by means
of the spiral being made to revolve, instead of the cotton and cotton
carrier; and by this arrangement the cotton is lifted perpendicular, and

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said John Thomas Stroud in the Great Seal Patent
Office, on the 5th November 1858.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I,
JOHN THOMAS STROUD, of Birmingham, in the County of Warwick,
send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Fifth day of May, in the year of our
Lord One thousand eight hundred and fifty-three, in the sixteenth year
of Her reign, did, for Herself, Her heirs and successors, give and
grant unto me, the said John Thomas Stroud, Her special license that
I, the said John Thomas Stroud, my executors, administrators, and
assigns, should at any time agree with, and no others, from time to
time and at all times thercafter 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 I, the said John Thomas Stroul, by
an instrument in writing under my hand and scal, 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 Thomas Stroud, do hereby
declare the nature of my said Invention, and in what manner the samic
is to be performel, to be particularly described and ascertained in and
by the following statement (that is to say):
My improvements first relate to pressure lamps, and consists in
making the oil chamber and valve of an angular form, which enables
me to make the stands for such lamps of a much more preferable shape
than heretofore in use.

page_text: And my improvements in lamp burners may be described under two
heads firstly, in the mode of raising or lowering the cotton; and,
secondly, in the construction of the cotton carrier; but in order that I
may be better understood I will proceed to describe the Drawings
hereunto annexed, which will best exhibit my improvements.
Figure 1, represents a pressure lamp without the outer or ornamental
case, exhibiting the oil chamber A, B, C, D, which being made square
(and which is the most preferable form) enables me to finish with that
chasteness of design and elegance of proportion so important and
desirable in table lamps.
Figure 2, represents a transverse section of the oil chamber taken
through K, K, Figure 1, showing a top view of the valve which
extends to L, L, L, L, exhibiting its form, in which consists its principle
novelty; and Figure 3, is a section taken through N, N, of the last
figure; 0, 0, is the leather valve; P, Q, the top and bottom plates, and
R, R, the sides of the oil chamber.
Figure 4, represents a new mode of raising or lowering the cotton in
lamp burners, whereby a great economy is effected and many objections
avoided. The Drawing, which is partly in section, represents my improve-
ments as applied to the description known as French Head Lamps, and
may be described thus:-The inner tube is secured to the oil cup by
the flange U, U, and screw V, V, the tube being long enough to be
enlarged and turned down, leaving sufficient room between for the
inner tube of the oil way, or case, to pass up. A spiral groove is
formed or cut, as shown at W, W, on the descending part of the air
tube, and a straight groove is formed down the side of the outer tube
shown at X, X. It is obvious that by turning the spiral by the oil
cup, or by holding the oil cup and turning the head, the cotton carrier
(being moved by the spiral) will rise or fall as required in a perpendicular
position.
Figure 5, is simply a top view of the burner showing the groove X,
and spiral W; and Figure 6, represents a collapsing cotton carrier.
applicable for such lamps; in describing which I have only to observe
that the pins or axis on which the jaw moves should project, one on
the inside and the other on the outside, as those two pins are required

page_text: to complete the action described in Figure 4, one pin taking into the
spiral W, and the other into the grove X, X.
Having thus described my Invention, and the manner of carrying
the same into effect, I wish it to be understood that I do not confine
myself to the exact detail herein mentioned or exhibited in the Drawings;
but what I claim as my Invention is, firstly, the making the oil chamber
and valves of pressure lamps of an angular form, without any regard to
the number of angles or sides of which they may be composed; but I
prefer using four sides, as shown in section at Figure 2. Secondly, I
claim as my Invention the mode of raising or lowering the cotton, as
shown in Figures 4, and 5. And lastly, I claim the construction of the
cotton carrier, as exhibited at Figure 6.
In witness whereof, I, the said John Thomas Stroud, have here-
unto set my hand and seal, this Fourth day of November, in
the year of our Lord One thousand eight hundred and fifty-three.