IMPROVEMENTS IN MINERS' SAFETY LAMPS
Year: 1872

page_text: LETTERS PATENT to Henry Key Doria, of Liverpool, in the County of
Lancaster, Coal Merchant, for the Invention of "IMPROVEMENTS IN
MINERS' SAFETY LAMPS."
Sealed the 26th November 1872, and dated the 29th May 1872.
PROVISIONAL SPECIFICATION left by the said Henry Key Doria at
the Office of the Commissioners of Patents, with his Petition, on
the 29th May 1872.
I, HENRY KEY DORIA, of Liverpool, in the County of Lancaster,
Coal Merchant, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN MINERS' SAFETY LAMPS," to be as follows:-
My Invention consists in constructing the chimnies of miners' safety
lamps of wire gauze and glass combined in manner following:-The
gauze is formed with an oval, circular, or other opening in its side,
preferably near the bottom opposite the flame. Au oval, circular, or
corresponding piece of glass having a groove formed on its rim or

page_text: edge is fitted in the said opening, and the edges of the wire gauze
are secured in the said groove by wire whipping or other convenient
If desired the wire fastening and edges can be sealed or
manner.
covered up.
The certain advantages of the insertion of the glass in manner afore- t
said are, -(1) increased light for working purposes from the same oil
and wick; (2) safety; (3) lowness of first cost; and (4) adaptability
to lamps now in use.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Henry Key Doria in the Great Seal Patent Office
on the 29th November 1872.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, HENRY
KEY DORIA, of Liverpool, in the County of Lancaster, Coal Merchant,
send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-ninth day of May, in the year
of our Lord One thousand eight hundred and seventy-two, in the thirty-
fifth year of Her reign, did, for Herself, Her heirs and successors, give
and grant unto me, the said Henry Key Doria, Her special licenco that
I, the said Henry Key Doria, my executors, administrators, and assigns,
or such others as I, the said Henry Key Doria, my executors, adminis-
trators, 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, excrcise, and vend,
within the United Kingdom of Great Britain and Ireland, the Channel
Islands, and Isle of Man, an Invention for “IMPROVEMENTS IN MINERS'
SAFETY LAMPS," upon the condition (amongst others) that I, the said
Henry Key Doria, 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.

page_text: with chimnies formed of wire gauze and glass combined, substantially
as herein described.
In witness whereof, I, the said Henry Key Doria, have hereunto
set my hand and seal, the Twenty-fifth day of November, in
the year of our Lord One thousand eight hundred and seventy-
two.
In the presence of
JAMES JOHNSON,
Clerk to J. T. King,
Liverpool.
HENRY KEY DORIA. (L.S.)