IMPROVEMENTS IN THE CONSTRUCTION OF ELECTRIC LIGHT APPARATUS
Year: 1875

page_text: LETTERS PATENT to Peter Jensen, of Chancery Lane, London, for
the Invention of "IMPROVEMENTS IN THE CONSTRUCTION OF ELECTRIC
LIGHT APPARATUS.” -A communication from abroad by Stanislas
Vikentievitch Konn, of St. Petersburg, in the Empire of Russia.
Scaled the 7th September 1875, and dated the 16th March 1875.
PROVISIONAL SPECIFICATION left by the said Peter Jensen at the
Office of the Commissioners of Patents, with his Petition, on the
16th March 1875.
.
I, PETER JENSEN, of Chancery Lane, London, do hereby declare the
5 nature of the said Invention for " IMPROVEMENTS IN THE CONSTRUCTION ОР
ELECTRIC LIGHT APPARATUS," (a communication to me from abroad by
Stanislas Vikentievitch Konn, of St. Petersburg, in the Empire of
Russia,) to be as follows:-
:
On to a metallic base piece a metallic socket is screwed air-tight. The
socket has a stuffing box, with vulcanized india-rubber packing and with

page_text: a gland, which receives an upright glass cylinder closed at the top.
Inside this glass cylinder there are two upright copper conductors
covered with glass tubing; one of these conductors is movable up and
down in a metallic socket fastened to the aforesaid metallic base piece;
the other conductor passes air-tight through the base piccc, which here
is fitted above and below with a gland having an insulating horngum
lining, the
space between the two glands being filled with unvulcanized
india-rubber washers. Under the aforesaid base piece there is a closed
hollow metallic chamber, in which copper conducting connection is
made between the bottom of the last named conductor and an insulated
binding screw in connection with the positive pole of an electric current ;
at its top this conductor is fastened to the bottom plate of the electric
light apparatus proper, while the top plate of the same is fastened to the
top of the first named conductor. The electric light apparatus proper
consists of say two rows of platina or silver studs resting in recesses in
the aforesaid bottom plate, and corresponding rows of platina or silver
studs passing through porcelain ferrules in the aforesaid top plate, but
the studs all project unequally through the top plate; the bottoms of
the upper studs fit into carbon or graphite sockets, and the tops of the
lower studs fit in other carbon or graphite sockets. Between these
upper and lower sockets carbon or graphite stems are inserted in recesses.
A contact plate made of silver or thickly silvered copper is jointed to
the first named conductor, and rests on the longest of the platina studs.
Should this carbon stem break, the contact plate drops on to the next
longest, and so on. The broken stems falling down are kept from
contact with the glass cylinder by a circular metallic shield placed inside
the glass cylinder in the lower part of the same. If the last stem should
break the extinguishing of other lamps in connection with the same
current is prevented by the falling of the contact piece on to a copper
stopping stem which is fastened by a set screw to the bottom plate, and
passes through a porcelain ferrule in the top plate.

page_text: heated to a white heat; the current then descends through the conductor
connected to the negative poles.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Peter Jensen in the Great Seal Patent Office on
the 16th September 1875.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, PETER
JENSEN, of Chancery Lane, London, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Sixteenth day of March, in the year of
our Lord One thousand eight hundred and seventy-five, in the thirty-
eighth year of Her reign, did, for Herself, Her heirs and successors, give
and grant unto me, the said Peter Jensen, Her special licence that I,
the said Peter Jensen, my executors, administrators, and assigns, or
such others as I, the said Peter Jensen, 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 "IMPROVEMENTS IN THE CONSTRUCTION OF
ELECTRIC LIGHT APPARATUS," (a communication to me from abroad by
Stanislas Vikentievitch Konn, of St. Petersburg, in the Empire of
Russia,) upon the condition (amongst others) that I, the said Peter
Jensen, 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 Peter Jensen, do hereby declare
the nature of the said Invention, and in what manner the same is to be

page_text: performed, to be particularly described and ascertained in and by the
following statement, reference being had to the accompanying Drawings
and to the letters of reference marked thereon, that is to say:
P
These improvements will be best understood by reference to the
accompanying Drawings, Fig. 1 and Fig. 2, which are vertical sections
at right angles to one another of an electric lamp constructed according
-to this Invention.
•
On to a metallic base piece a a metallic socket b is screwed air-tight
The socket has a stuffing box, with vulcanized india-rubber packing d,
and with a gland c, which receives an upright glass cylinder closed at
the top. Inside this glass cylinder there are two upright copper
conductors and f¹ covered with glass tubing; one of these conductors
fis movable up and down in a metallic socket y fastened to the afore-
said metallic base piece a, the other conductor f¹ passes air-tight through
the base piece a, which here is fitted above and below with a gland h,
having an insulating horngum lining, the space between the two glands
being filled with unvulcanized india-rubber washers i. Under the base
piece a there is a closed hollow metallic chamber above the base-or solo
plate, in which chamber a copper conductor f" forms, connection
between the bottom of the conductor f¹ and an insulated binding screw
k in connection with the negative pole of an electric current. At its'
top this conductor fis fastened to the bottom plate p of the electric
light apparatus proper, while the top plate of the same q is fastened to
the top of the first named conductor f. The electric light apparatus]
proper consists of say two rows of platina or silver studs o resting in
recesses in the aforesaid bottom plate p, and corresponding rows of
platina or silver studs o passing throughi porcelain ferrules in the afore-
said top. plate q; but the studs all' project unequally through the top:
plate. The bottoms of the upper studs o fit into carbon or graphite
sockets, and the tops of the lower studs fit in other carbon or graphite
sockets n.
Between these upper and lower sockets carbon or graphite
stems mare inserted in recesses. A contact plater made of silver or
thickly silvered copper is jointed to the first named conductor f, and
rests on the longest of the platina studs o. Should this carbon stem
break, the contact plater drops on to the next longest stud o, and so on.
The broken stems m falling down are kept from contact with the glass
cylinder v by a circular metallic shield w placed inside the glass cylinder
"
י
..

page_text: in the lower part of the same. If the last stem should break the
extinguishing of other lamps in connection with the same current is
prevented by the falling of the contact piece on to a copper stopping
stem, which is fastened by a set screw to the bottom plate p, and
passes through a porcelain ferrule in the top plate.
A small tapæ in connection with the interior of the glass cylinder
serves for pumping out the air.
The positive pole current entering the base piece a by a binding screw
passes through the metallic socket up to the contact piece t at the top,
thence to the carbon stem m in contact therewith, which stem is thereby
heated to a white heat, the current then descends through the conductor
f¹ and f" connected to the negative pole.
Should the glass cylinders break the entering air will cause the rapid
combustion of the carbon stem.
And having thus fully described and ascertained the nature of this
Invention I declare that I claim as the aforesaid improvements in the
construction of clectric light apparatus,—
Firstly. The mode of mounting the carbon stems, substantially as set
forth.
Secondly. The guard plate or shield w in combination with a closed
glass cylinder or chamber v.
Thirdly. The contact piece t in combination with two or more studs o
of unequal lengths, and with the stopping stem t.
And, Fourthly. The general arrangement of parts, substantially as
set forth.
In witness whereof, I, the said Peter Jensen, have hereunto
set my hand and scal, this Fifteenth day of September, in
the year of our Lord One thousand eight hundred and seventy-
fivc.