MAKING A NEW LAMP AND BURNER, AND OF MAKING, MOULDING, AND FORMING GLASS LENSES
Year: 1791

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, 3, JAMES
SMETHURST, of the Borough of Southwark, in the County of Surrey, Tin Plate
Worker, send greeting.
WHEREAS His present Majesty hath, by His Letters Patent under the
Groat Seal of Great Britain, bearing date the Eighteenth day of October last,
for Himself, His heirs and successors, given and granted to me, the said James
Smicthurst, my-executors, administrators, and assigns, His especial licence,
priviledge, and authority for the sole use and benefit of my Invention of
"MAKING A NEW LAMP AND BURNER, AND OF MAKING, MOULDING, AND FORMING
GLASS LENSES," within the Dominions of Great Britain called England,
Dominion of Wales, and Town of Berwick-upon-Tweed, and also within His
Majesty's Plantations abroad, for the term of fourteen years, subject to a
proviso or condition, for me, the said James Smethurst, to cause a description of
the nature of the said Invention, and in what manner the same is to be per-
formed, by writing under my hand and seal, to be inrolled in His Majesty's
High Court of Chancery within one calendar month next after the date thereof,
as in and by the said Letters Patent, relation being thereto had, will more
fully appear.
NOW KNOW YE, that I, the said James Smethurst, in compliance with the
said proviso, do hereby declare that my said Invention is described in the Plan
or Drawings hereunto annexed, and particulars thereof hereunder written.
In witness whereof, I have hereunto set my hand and scal, this
Seventeenth day of November, in the year of our Lord One thousand
seven hundred and ninety-one.
JAMES SMETHURST. (L.S.)

page_text: THE PARTICULARS OF THE INVENTION OF JAMES SMETHURST, OF THE BOROUGH
OF SOUTHWARK. IN THE COUNTY OF SURREY, TIN PLATE WORKER, REFERRED
TO IN THE ABOVE DEED, POL.L.
The end and design of this lamp is to produce a strong light, and so to
manage that light that it may be thrown in any required direction. But
this is not the only advantage and peculiarity in its construction; for while
this lamp difluses a strong light to a great distance, it does not create or
leave any unpleasant shade or darkness; light is communicated all round
from the fore part, the back part, the sides, and the bottom of the lamp.
Lamps have been heretofore contrived to give a strong light in particular
directions, but in any other, or in most other directions, they have been
attended with a disagreeable shade. The end and design of this lamp being
thus defined, I shall now particularize the means whereby it may be effected.
It consists of a lamp for one, two, three, or four bevilled or sloped lenses;
the lenses may be plain convex, double convex, concavo-convex, or of unequal
convexities; the hevill to the lenses may be strait, oblique, concave, or convex
in any direction, or curvex, or of any figure or shape, with many or few
angles; one, two, three, or more sides of the lenses inay be bevilled, or any
portion of its curvation, circumference, and sides; the bevilled lenses may be
fixed so as to be immoveable, or so as to be moved in any required, direction.
Tho lamp and lenses are made to hang on the frame, or the frame or lamp, or
the part containing the oil or cotton, may be affixed to the lenses; the lamp
may be taken out independent of or with the lenses; the lamp or part contain-
ing the oil and cotton may be made of any shape, form, or pattern. The
burners, or piece carrying the cotton or wick, may also be made of any shape or
form; it may be fixed or moveable, sliding backwards or forwards, or remaining
in any given position, to throw or spread the light in any direction or position;
it may be made to hold either a flat, or a round, or irregular shaped cotton or
wick. The burner and lamp may be taken in and out with great case; they
may be taken out and lenses left behind, or they may be taken out together
with the lenses, or used without any lenses at all, if required. The bevilled
lenses may be used or applied to advantage to lamps for streets, squares,
houses, halls, staircases, passages, lanes, alleys, or for reading, writing, and for
all other purposes where a strong and diffused light is required.
Fig. 1 represents a lamp or burner with three bevilled lenses a, b, c; the
bottom and two of the sides of each of these lenses are bevilled; the lamp d, e,
is of the fountain kind. and is connected by a tube with the part f, g, which
carries the cotton; the burner or tube cannot be seen in the Drawing, being

page_text: hid by the lens. b, h, i, k, is the frame to which the lamp and lenses are
affixed.
Fig. 2 represents a circular lamp or burner with two bevilled lenses. This
Drawing shews the manner in which the lenses may be affixed so as to be
moveable in various directions. a, b, c, d, the circular part of the burner or
lamp; if, the neck, trough, or receiver, which carries the wick and oil; this
is here represented as moveable in a groove, or may be set in different positions
by the piece g. h, i, is the wire by which the lamp or burner is suspended.
Fig. 3 represents a ractangular lamp or burner, in other respects similar
to the former.
Ti ronnocents the lam