AN IMPROVED LAMP FOR LIGHTING MINES
Year: 1862

page_text: and Son, of No. 11, Wellington Street, Strand, in the County of
Middlesex, Patent Agent, for the Invention of "AN IMPROVED LAMP FOR
LIGHTING MINES." -A communication from abroad by Alphonse Dumas,
of No. 15, Passage des Petites Ecuries, Paris, France, Engineer,
superintending the Mines of Luc.
PROVISIONAL SPECIFICATION left by the said William Edward Gedge,
at the Office of the Commissioners of Patents, with his Petition, on the
11th April 1862.
I, WILLIAM EDWARD GEDGE, of the firm of John Gedge and Son, of No. 11,
Wellington Street, Strand, in the County of Middlesex, Patent Agent, do
hereby declare the nature of the said Invention for "AN IMPROVED LAMP FOR
LIGHTING MINES," (communicated to me from abroad by Alphonse Dumas,
of No. 15, Passage des Petites Ecuries, Paris, France, Engineer, superin-
tending the Mines of Luc), to be as follows:-
This improved lamp, which is not only adapted for use in mines, but in
all places where explosions are to be apprehended, or there is not a sufficiency
of pure air to permit the use of an ordinary lamp, is composed of two parts.
The first consists of a cubic box covered with a light casing of galvanized iron,
and is divided into two compartments, one receiving an induction bobbin, and
the other the elements of a generating pile. The second part is composed of
cylindrical glass tubes, metal fastenings at the extremities of which receive

page_text: conducting rods, and have an opening by which a vacuum is produced in the
tubes. Each tube being charged with non-metallic fluoric matters, and the
air exhausted, is screwed horizontally on to the anterior face of the box (which
is furnished with reflectors), and the generating pile being charged, produces
light on the glass tubes containing the fluoric matter (which is similar to that
used in the production of the electric light), and this light will reflect on the
spot or to a distance of half a mile. All the parts which might evolve sparks
are covered with an isolating casing.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said William Edward Gedge, in the Great Seal Patent Office on
the 9th October 1862.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
EDWARD GEDGE, of the firm of John Gedge and Son, of No. 11, Wellington
Street, Strand, in the County of Middlesex, Patent Agent, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Eleventh day of April, in the year of our Lord One
thousand eight hundred and sixty-two, in the twenty-fifth year of Her reign,
did, for Herself, Her heirs and successors, give and grant unto me, the
said William Edward Gedge, Her special licence that I, the said William
Edward Gedge, my executors, administrators, and assigns, or such others as I,
the said William Edward Gedge, 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
"AN IMPROVED LAMP FOR LIGHTING MINES," (a communication to me from
abroad by Alphonse Dumas, of No. 15, Passage des Petites Ecuries, Paris,
France, Engineer, superintending the Mines of Luc), upon the condition
(amongst others) that I, the said William Edward Gedge, 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 William Edward Gedge, do hereby
declare the nature of the said Invention, and in what manner the same is