IMPROVEMENTS APPLICABLE TO STREET AND SIGNAL LAMPS
Year: 1874

page_text: LETTERS PATENT to George Grainger Tandy, of Penge, in the County
of Surrey, Gentleman, for the Invention of "IMPROVEMENTS APPLICABLE
TO STREET AND SIGNAL LAMPS."
Scaled the 4th September 1874, and dated the 10th March 1874.
PROVISIONAL SPECIFICATION left by the said George Grainger Tandy
at the Office of the Commissioners of Patents, with his Petition,
on the 10th March 1874.
I, GEORGE GRAINGER TANDY, of Penge, in the County of Surrey,
Gentleman, do hereby declare the nature of the said Invention for "IM-
PROVEMENTS APPLICABLE TO STREET AND SIGNAL LAMPS," to be as follows:-
"
―
My Invention of improvements applicable to street and signal lamps
has for its object to so construct and arrange these lamps that they may
be used for burning hydrocarbon oils instead of hydrogen gas; one of
the principal advantages of the Invention being that I can adapt the
present lanterns for the use of my improvements.

page_text: In carrying out the Invention I first remove the gas burner and
fittings and the top of the lantern, and I, by preference, construct the
oil reservoir of a spherical form, and make an air passage through the
reservoir to the interior of the burner. The lower part of this air passage
is connected to a downcast tube, which if the lantern is quadrangular is
carried down one of the corners or angles thereof. If the lantern is
spherical the air tube may follow the internal curve, or in the case of a
bracket lamp the downcast tube may be made to form part of the
supporting bracket. This air tube terminates in a chamber formed in
the top of the lantern by a horizontal metal reflector above the burner.
A hole is cut in the central part of the reflector to receive a metal
chimney which extends up into the air chamber and terminates in
cylindrical space constructed at the top of the dome or cover of the
lantern. Lateral openings are made at the upper part of this cylindrical
space, and these openings are covered by a guard which will prevent
sudden gusts of wind from getting into the air space and interfering
with the flame.
By the above arrangement. I am enabled to dispense with glass
chimnies and thereby avoid the nuisance and inconvenience occasioned
SPECIFICATION in pursuance of the conditions of the Letters Patent
filed by the said George Grainger Tandy in the Great Scal Patent
Office on the 10th September 1874.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, GEORGE.
GRAINGER TANDY, of Penge, in the County of Surrey, Gentleman, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, bý Her
Letters Patent, bearing date the Tenth day of March, in the year of
our Lord One thousand cight hundred and seventy-four, in the thirty-
seventh year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said George Grainger Tandy, Her.special
licence that I, the said George Grainger Tandy, my executors, admini-
strators, and assigns, or such others as I, the said George Grainger Tandy,
my executors, administrators, and assigns, should at any time agree

page_text: 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 APPLICABLE TO STREET AND SIGNAL LAMPS," upon the con-
dition (amongst others) that I, the said George Grainger Tandy, my
executors or administrators, by an instrument in writing under my, or
their, or one of their hands and scals, 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
Scal Patent Office within six calendar months next and immediately
after the date of the said Letters Patent..
.
NOW KNOW YE, that I, the said George Grainger Tandy, do hereby
declare the nature of my said Invention, and in what manner the same
is to be performed, to be particularly described and ascertained in and
by the following statement, reference being had to the Drawing here-
unto annexed, and to the letters and figures marked thereon (that is to
say):
My Invention of improvements applicable to street and signal lamps
has for its object to so construct and-arrange these lamps that they may
be used for burning hydrocarbon oils instead of hydrogen gas; one of
the principal advantages of the Invention being that I can adapt the
present lanterns for the use of my improvements.
Fig. 1 in the accompanying Drawing represents a vertical section of
a street lamp with my improvements adapted thereto; Fig. 2 is horizontal
section or plan of the same.
In carrying out the Invention I first remove the ordinary gas burner
and fittings, and also the top of the lantern, and I, by preference, con-
struct the oil reservoir of a spherical form, as shewn at a, Fig. 1, and
make an air passage 6 through the reservoir to 'the interior of the
burner c; the lower part of this air passage is connected to a downcast
tube d, which if the lantern is quadrangular is carried down one of the
corners or angles thereof, as shewn in the Drawing. If the lantern is
spherical the air tube may follow the internal curve, or in the case of a
bracket lamp the downcast tube may be made to form part of the
supporting bracket; this air tube terminates at its upper end in a
chamber e, e, formed in the top of the lantern by a horizontal metal

page_text: reflector ff, above the burner; a hole is cut in the central part of the
reflector to receive a metal chimney g, which extends up into the air
chamber e and terminates in a space e¹ constructed at the top of the
dome or cover of the lantern; lateral openings h, h, are made at the
upper part of this space e¹, and these openings are covered by a guard i, i,
which will prevent sudden gusts of wind from getting into the air space e
and interfering with the flame of the burner.
By the above arrangement I am enabled to dispense with glass
chimneys and thereby avoid the nuisance and inconvenience occasioned
by the breakage of these latter.
Having now described my Invention of "Improvements Applicable.to
Street and Signal Lamps," and having explained the manner of carrying
the same into effect, I claim as the Invention secured to me by Letters
Patent as aforesaid the mode herein set forth of constructing, arranging,
and adapting street and signal lamps for burning hydrocarbon oils.
In witness whereof, I, the said George Grainger Tandy, have here.
unto set my hand and seal, the Tenth day of September, in the
year of our Lord One thousand eight hundred and seventy-
four.