IMPROVEMENTS IN MAGNETO-ELECTRIC MACHINES
Year: 1872

page_text: LETTERS PATENT to John Henry Johnson, of 47, Lincoln's Inn
Fields, in the County of Middlesex, Gentleman, for the Invention
of "IMPROVEMENTS IN MAGNETO-ELECTRIC MACHINES."—A communication
from abroad by Zenobe Theophile Gramme and Eardley Louis
Charles d'Ivernois, both of Paris, France.
PROVISIONAL SPECIFICATION left by the said John Henry Johnson
at the Office of the Commissioners of Patents, with his Petition, on
the 26th April 1872.
I, JOHN HENRY JOHNSON, of 47, Lincoln's Inn Fields, in the County
§ of Middlesex, Gentleman, do hereby declare the nature of the said
Invention for "IMPROVEMENTS IN MAGNETO-ELECTRIC MACHINES," a commu-
nication to me from abroad by Zenobe Theophile Gramme and Eardley
Louis Charles d'Ivernois, both of Paris, France, to be as follows :—
This Invention relates to improvements in the continuous current
magneto-electric machine described in the Specification of the Patent
No. 1668, A.D. 1870, and consists in the application and use to and in

page_text: such machines of electro-magnets having consequent poles, and also in
the use of rubbers composed of a number of wires united in the form of
a bundle or sheaf, whereby they are less liable to become worn and the
production of sparks is prevented.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the 'said John Henry Johnson in the Great Seal Patent
Office on the 25th October 1872.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN 1
HENRY JOHNSON, of No. 47, Lincoln's Inn Fields, in the County of
Middlesex, Gentleman, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-sixth day of April, in the year
of our Lord One thousand eight hundred and seventy-two, in the thirty- 1
fifth year of Her reign, did, for Herself, Her heirs and successors, give
and grant unto me, the said John Henry Johnson, Her special license
that I, the said John Henry. Johnson, my executors, administrators, and
assigns, or such others as I; the said John Henry Johnson, my executors,
administrators, or assigns, should at. any time agree with, and no 2
others, from time to time and 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 IN
MAGNETO-ELECTRIC MACHINES," a communication to me from abroad by 2
Zenobe Theophile Gramme and Eardley Louis Charles d'Ivernois, both
of Paris, France, upon the condition (amongst others) that I, the said
John Henry Johnson, my executors or administrators, by an instru-
ment in writing under my hand and seal, should particularly describe
and ascertain the nature of the said Invention, and in what manner 3
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 imme-
diately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said John Henry Johnson, do hereby
declare the nature of tlic șaid Invention, and in what manner the 3

page_text: same is to be performed, to be particularly described and ascertained in
and by the following statement, that is to say :-
The said Invention relates to improvements in the continuous current
magneto-electric machine described in the Specification of the Patent
No. 1668, A.D. 1870, and consists in the application and use to and
in such machines of one or more rubbers or conductors for collecting
and conducting the currents composed each of a number of wires united
together in the form of a bundle, brush, or sheaf in substitution for the
metal springs, rollers, or other conducting rubbers referred to in the
said Specification, whereby the said improved rubbers are less liable to
become worn and the production of sparks is prevented.
This improved magneto-electric machine is applicable for all purposes
where magneto-electric machines or galvanic batteries can be usefully
employed.
In witness whereof, I, the said John Henry Johnson, have to
this my Specification set my hand and seal, this Twenty-third
day of October, One thousand eight hundred and seventy-two.