Improvements in Incandescent Electric Lamps.
Year: 1891

page_text: Date of Application, 18th Mar., 1891
Complete Specification Left, 22nd Apr., 1891-Accepted. 23rd Mav. 1891
PROVISIONAL SPECIFICATION.
Improvements in Incandescent Electric Lamps.
MARK BAILEY Hollies Lodge Clarence Road Wood Green London N.
Electrician, and JOHN WARNER 21 Osborn Street Whitechapel London E. Iron-
founder do hereby declare the nature of this invention to be as follows:
--
The conductor is formed of carbon admixed with calcium oxide and is wound
helically and formed into a ring divided at its semi diameter; the ends of each
opposite half of the so divided ring are then united and secured to the leading in
wires conveying the current. By this arrangement I obtain a conductor having
large sectional area, giving a better diffusion of light and I avoid the blackening of
the glass containing globe. The conductor being in the form of a divided ring
prevents the extinction of light should one half of the ring be burnt out or
broken.
Several rings divided and connected as described can be mounted within the same
globe if desired.
ML
101 1001
COMPLETE SPECIFICATION.
Improvements in Incandescent Electrio Lamps.
MARK BAILEY, Hollies Lodge Clarence Road, Wood Green, London N.
Electrician and JOHN WARNER, 21 Osborn Street, Whitechapel, London E. Iron-
founder do hereby declare the nature of this invention and in what manner the same
is to be performed, to be particularly described and ascertained in and by the
following statement :-
The conductor is formed of carbon admixed with calcium oxide and is wound
helically and formed into a ring divided at its semi-diameter, the ends of each
opppsite half of the so divided ring are then united and secured to the leading in
wires conveying the current.
By this arrangement we obtain a conductor having large sectional area, giving a
better diffusion of light, and avoid the blackening of the glass containing globe.
The conductor being in the form of a divided ring, prevents the extinction of light,
should one half of the ring be burnt out or broken.
Several rings divided and connected as described, can be mounted within the same
globe if desired.
The way and manner in which we carry out our invention will be readily under-
stood by reference to the drawing in which―
Fig. 1. is a plan of flat helically wound conductor, formed into a divided
ring.
Fig. 2. is a front elevation shewing the helically wound conductor, mounted
within an exhausted globe.
Fig. 3. is a side elevation of the same.
Fig. 4. is a plan looking up of cylindrical conductor helically wound.
Fig. 5. is a plan, and Fig. 6 a side view of flat conductor, shewing method of
jointing same.
We form the conductors of an admixture of collodion enamel to which such a
proportion of calcium oxide is added as shall after calcination confer upon the
resulting compound carbon conductor a hard exterior surface. The conductors are,
[Price fd1

page_text: prior to calcination helically or spirally wound, and are then bent into a semi-
circular, elliptical or other suitable shape, the opposite ends of each half of the ring
or equivalent shape are then united, and connected to the leading in wires.
Fig. 1. shews a conductor a, of flat section wound helically, the opposite ends b, b₁
of the divided ring thus formed being united by a yoke c c¹ usually formed from a
piece of fine metal tube, into which they are cemented, the platinum leading in
wires d, d are then passed through a hole bored transversely through the yoke.
The conductor thus mounted is sealed into a glass globe e, see Figs. 2, and 3, from
which the air is subsequently exhausted.
Fig. 2 shews a front elevation and Fig. 3 a side elevation of a completed lamp
constructed in accordance with our improvements.
Fig. 4. is a plan looking up of a helically wound cylindrical conductor mounted
up in the manner just described.
Fig. 5 and 6. shew the way we form the joint when flat conductors are used, the
ends of the opposite halves of the ring are flattened out and the leading in wires dd
screwed and secured thereto by two nuts f,f:
By preparing the conductors with a material capable of conferring a hard external
surface, we avoid their disintegration and the consequent blackening of the globe,
while the helically, wound ring shape, enables a large sectional area to be obtained
and when mounted horizontally within the globe as shewn, gives a better diffused
light. Conductors constructed in accordance with our improvements are especially
suitable for lamps of high candle power-and when required, several pairs of
conductors may be enclosed within the same globe.
It will be seen that by means of the divided ring coupled up in parallel the risk
of the total extinction of light is considerably reduced, as should one half of the ring
conductor be burnt out or ruptured the remaining half would remain incandesced.
The helical shape also confers great mechanical strength upon the conductor when
mounted up and presents a broad surface of illumination.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is :-
1. The combination in or with an incandescent electric lamp, of a helically wound
conductor constructed as described, formed into a divided ring and mour,
horizontally within an exhausted globe as set forth.
Pred
2. The combination in or with an incandescent electric lamp of a divided on-
ductor, so proportioned and connected to the electrodes as that equal current sall
pass through each half of the ring or equivalent shape mounted horizontally within
the globe.
Dated Anril 22nd 1891
FRANCIS M. ROGERS,
Agent.