AN IMPROVEMENT IN ILLUMINATING BY ELECTRICITY
Year: 1879

page_text: LETTERS PATENT to George Grout, of 21, Harringay Grove, Hornsey, in the
County of Middlesex, Engineer, and Ried. Sennett, of 79, Blackfriars Rd.,
Southwark, in the County of Surrey, for the Invention of "AN IMPROVEMENT
IN ILLUMINATING BY ELECTRICITY."
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Sealed the 19th December 1870, in pursuance of an Order of the Lord Chancellor,
and dated the 0th Tuna 1950
PROVISIONAL SPECIFICATION left by the said George Grout and Ried.
Sennett at the Office of the Commissioners of Patents on the 9th June
1879.
GEORGE GROUT, of 21, Harringay Grove, Hornsey, in the County of Middlesex,
Engineer, and RIC. SENNETT, of 79, Blackfriars Rd., Southwark, in the County of
Surrey. "AN IMPROVEMENT IN ILLUMINATING BY ELECTRICITY."
To increase the illuminating power of the electric arc by passing gasses or vapours
rich in carbon or other substances in a fine state of division into the electric arc, by
which means the carbon or other substances become incandescent, and so increase
the light. To accomplish which we take the electrodes or pencils of carbon as at
present used, but with the addition of holes made through one or both lengthway,
to form a tube for the passage of the gas or vapour or other substances in a fine
state of division to be submitted to the incandescent action of the electric arc.
When powders or substances in a fine state of division are used they can very con-
veniently be projected through the tube electrode by means of a current of gas or
atmospheric air. In another form of electrode we use in the place of the tubular
carbon pencils any comparatively infusable conductor of electricity, as platinum or
iridium, for the passage of the gas or vapour, or other substances in a fine state of
division. This Invention can be applied to most of the existing lamps at present
in use for illuminating by electricity.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said George Grout and Richard Sennett in the Great Seal Patent Office
on the 22nd December 1879.
GEORGE GROUT, of 21, Harringay Grove, Hornsey, Middlesex, Engineer, and
RICHARD SENNETT, of 79, Blackfriars, in the County of Surrey. "AN IMPROVE-
MENT IN ILLUMINATING BY ELECTRICITY."
To increase the illuminating power of the electric are by passing gasses or vapours
rich in carbon or other substances in a fine state of division into the electric arc, by
which means the carbon or other substances become incandescent, and so increase
the light. To accomplish which we take the electrodes or pencils of carbon as at
present used, but with the addition of holes made through one or both lengthways,
to form a tube for the passage of the gas or vapour, or other substances in a fine
state of division to be submitted to the incandescent action of the electric arc.
When powders or substances in a fine state of division are used they can very con-
veniently be projected through the tube electrode by means of a current of gas or
atmospheric air. In another form of electrode we use in the place of the tubular
carbon pencils any comparatively infusable conductor of electricity, as platinum or
iridium, for the passage of the gas or vapour or other substances in a fine state of
division. This Invention can be applied to most of the existing lamps at present in
use for illuminating by electricity.
Having thus described the nature of our said Invention, we would have it
understood that what we claim is,-
To increase the illuminating power of the electric arc by passing through or
around the electrodes gases or vapours rich in carbon or other substances in a fine
state of division, by which means they become incandescent, and so increase the
light.
In witness whereof, we, the said George Grout and Richard Sennett, have
hereunto set our hands and seals, this Twentieth day of December, in
the year of our Lord One thousand eight hundred and seventy nine.