IMPROVEMENTS IN ELECTRIC LAMPS
Year: 1881

page_text: LETTERS PATENT to Arthur William Lovell Reddie, of the Office for Patents,
66, Chancery Lane, in the County of Middlesex, Patent Agent, for an
Invention of "IMPROVEMENTS IN ELECTRIC LAMPS." A communication from
abroad by Denis Alexandre Chertemps, of Paris, in the Republic of France.
PROVISIONAL SPECIFICATION left by the said Arthur William Lovell
Reddie at the Office of the Commissioners of Patents on the 2nd August
1881.
ARTHUR WILLIAM LOVELL REDDIE, of the Office for Patents, 66, Chancery Lane,
in the County of Middlesex, Patent Agent. "IMPROVEMENTS IN ELECTRIC LAMPS."
[A. communication from abroad by Denis Alexandre Chertemps, of Paris, in the
Republic of France.]
This Invention relates to a novel arrangement of electric lamp, the objects being
to simplify its construction and to enable it to receive carbons of any desired
length.
The clock work which ensures the maintainnance of the upper carbon in proper
relation to the lower carbon is mounted on a column and enclosed in a box, which
protects it from dust and damp. In this column works the rack rod which carries
the upper carbon holder; and to provide for the adjustment, back-and-front and
sideways, the holder is mounted on its rack rod in the following manner :-
Fitted to the upper end of the rack rod is a socketted piece which terminates in
a vertical tenon, which is intended to receive a pivot pin. The carbon holder,
which is formed as usual to receive the carbon, has a cylindrical stalk which fits
into a horizontal socket carried by a forked piece, which has for its fulcrum the
pivot pin of the tenon. Tapped into the back edge of the tenon is a screw which
passes through a solid part at the back of the fork. By turning this screw the fork
Price 6d1

page_text: and its socket will be tipped on their pivot pin, and will thereby cause the carbon
holder to advance or draw back the point of the carbon..
To adjust the carbon point sideways, the stalk of the holder is provided with a
lug which projects through a slot in the side of the racking socket piece. At
opposite sides of this lug the socket piece is provided with two similar lugs, and
through these lugs an adjusting screw is passed, which is tapped into the lug of the
carbon holder and receives a binding nut at its extremity. By turning this screw
a slight axial motion is imparted to the holder, and thus the carbon point may be
adjusted sideways. with great accuracy.
To allow of the lower carbon holder carrying any desired length of carbon, its
rod is furnished with a bracket holder, which carries the carbon at the side of the
rod instead of its being in line therewith as usual.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Arthur William Lovell Reddie in the Great Seal Patent Office on
the 2nd February 1882.
ARTHUR WILLIAM LOVELL REDDIE, of the Office for Patents, 66, Chancery Lane,
in the County of Middlesex, Patent Agent. "IMPROVEMENTS IN ELECTRIC LAMPS."
A communication from abroad by Denis Alexandre Chertemps, of Paris, in the
Republic of France.
This Invention relates to a novel arrangement of electric lamp, the objects in
view being to simplify its construction, and to enable it to receive carbons of any
desired length. .
In the accompanying Drawing, Fig. 1 represents an elevation partly in section
of a lamp fitted with these improvements; and Fig. 2 is a transverse section
thereof, taken on the line 1, 2, of Fig. 1.
The lamp, herein shewn and described, somewhat resembles the Serrin lamp in
its general arrangement, but it may be adapted to suit a variety of conditions of
illumination by simply modifying the dimensions and arrangements of the parts, so
as to give to the lamp the proportion and appearance of an ordinary Carcel or
moderator lamp.
The clockwork movement o, p, q, h, which ensures the maintenance of the upper
carbon A in proper relation to the lower carbon B is mounted on a column C, and
is enclosed in a box y, which protects it from dust and damp; a single opening only
being left at y' for the insertion of the spring pawl g fixed to the lower carbon
holder E. In this column C works the rack rod k which carries the upper carbon
holder F; and to provide for its adjustment back and front and sideways, the
carbon holder F is mounted on its rack rod in the following manner-
Fitted to the upper end of the rack rod , and secured thereto by the pin e, is a
socketted piece f' which terminates in a vertical tenon, which is intended to receive
a pivot pin f³. The carbon holder, which is formed as usual at to receive the
carbon, has a cylindrical stalk f5 which fits into a horizontal socket f carried by a
forked piece f, which has for its fulcrum the pivot pin f³ of the tenon f¹. Tapped
into the back edge of the tenon is a screw f' which passes through a solid part at
the back of the forked piece f. By turning this screw f* the forked piece f2 and
its socket f will be tipped on their pivot pin f³, and will thereby cause the carbon
holder F to advance or draw back the point of the carbon A.
To adjust the carbon point sideways, the stalk f of the holder F is provided
with a lug f', which projects through a slot in the side of the rocking socket-
piece 6. At opposite sides of this lug f" the socket piece f6 is provided with two
similar lugs, and through these lugs an adjusting screw f8 is passed, which is
tapped into the lug f' on the stalk of the carbon holder, and receives a binding
nut fo at its extremity. By turning this screw f³, a slight axial motion will be
imparted to the stalk of the carbon holder, and thus the carbon point A may be
adjusted sideways with great accuracy.
Thus it will be seen that the upper carbon holder I may have a two fold
movement of adjustment imparted to it by means of the screws f* and f³.
To allow of the holder of the lower carbon B carrying any desired length of
carbon, its rod H is furnished with a bracket holder e, which carries the carbon at
the side of the said rod instead of in line there with as usual.
By these improvements the carbons may be adjusted with facility, and carbons
of any practicable length may be employed; an economy as respects waste ends of
carbon being thereby effected. The clockwork mechanism will also be practically
protected from dust and damp by means of the close casing y. It will be

page_text: understood that the solenoid a serves as a guide for the lower carbon holder E,
and at the same time serves to separate the carbons directly the current passes,
so as to produce the arc. The spring pawl g carried on the holder E will at
the same moment gently, arrest the movement of the train of wheels o, p, q, h,
until again caused to release them by the rise of the lower carbon holder, when the
rack rod will be free to descend, thus bringing the carbons again in contact.
Having now set forth the nature of this Invention of "Improvements in Electric
Lamps," as communicated to me by my foreign correspondent, and having explained
in what manner the same may be carried into practical effect, I wish it to be
understood that I claim,-
First. The novel construction of carbon holder capable of a twofold movement
of adjustment, substantially as and for the purpose described with reference to the
Drawing.
Secondly. The arrangement of carbon holders, described with reference to the
Drawing, whereby I am enabled to use carbons of any desired length, the proper
relation of their inner ends being maintained as set forth.
In witness whereof, I, the said Arthur William Lovell Reddie, have hereunto
set my hand and seal, the Second day of February, in the year of our
Lord One thousand eight hundred and eighty two.
ARTHUR W. L. KEDDIE. (L.S.)