Improvements in connection with Electric Arc Lamps.
Year: 1898

page_text: Date of Application, 19th Nov., 1898
Complete Specification Left. 19th Aug., 1899-Accepted, 23rd Sept., 1899
PROVISIONAL SPECIFICATION.
Improvements in connection with Electric Arc Lamps.
We, WILLIS NELSON STEWART, of 130, Lambeth Road, S.E., Electrical
Engineer, and HENRY HALLIFAX WELLS, of 16, Paternoster Row, in the City
of London, Solicitor, do hereby declare the nature of this invention to be as
follows:-
-
It has heretofore been proposed that the arc of electric lamps should be
formed in a globe or vessel practically sealed to the air below, and having a
contracted opening above through which the top carbon passes.
These globes
have been formed of blown glass and have also been formed of moulded glass
provided with a metal top through which the upper carbon passes, the con-
tracted opening being formed through the metal plug, or through the metal
cover.
According to this invention it is proposed that the glass or globe should be
formed of two or more pieces in order to facilitate the moulding and adjustment.
This end may be attained-in the following way; the globe may be formed of two
or more parts provided with suitable bearing surfaces, such surfaces being placed
together to form the globe and held by binding with a spring ring, or otherwise.
Or the main portion of the globe may be formed with one of the contracted
openings, the other contracted opening being composed of a separate piece into
which the globe fits, or both ends may be made of separate pieces.
1000
PHILIP M. JUSTICE,
and 56, Chancery Lane, Chartered Patent Agent,
For the Applicant.
Improvements in connection with Electric Arc Lamps.
We, WILLIS NELSON STEWART, of 130, Lambeth Road, S.E., Electrical
Engineer, and HENRY HALLIFAX WELLS, of 16, Paternoster Row, in the City
of London, Solicitor, 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:-
It has heretofore been proposed that the arc of electric lamps should be
formed in a globe or vessel practically sealed to the air below, and having a
contracted opening above through which the top carbon passes. These globes
have been formed of blown glass and have also been formed of moulded glass

page_text: provided with a metal top through which the upper carbon passes, the con-
tracted opening being formed through the metal plug, or through the metal
cover.
According to this invention it is proposed that the glass or globe should be
formed of two or more pieces in order to facilitate the moulding and adjustment.
This end may be attained in the following way: the globe may be formed of two
or more parts provided with suitable bearing surfaces, such surfaces being placed
together to form the globe and held by binding with a spring ring, or otherwise.
Or the main portion of the globe may be formed with one of the contracted
openings, the other contracted openings, being composed of a separate piece into
which the globe fits, or both ends may be made of separate pieces.
In the accompanying drawing are illustrated by way of example several forms
of globes constructed according to this invention.
In the form shewn in Fig. 1 the globe is formed in two parts or halves a a¹
transversely, the edges of one part or half being arranged to enter the other
part or half so that the necessary bearing surfaces are provided for supporting
the two parts. One part or half may carry, a reduced or neck portion
closely surrounds the upper carbon while the lower part or half has an opening c
of sufficient size for the lower carbon or holder.
which
In Figs. 2 and 3 the construction is very similar but the upper part is
smaller than the lower and is shaped more as a cap or cover to the latter. In
Fig. 4 the body or main portion a is straight or tubular its edges being flared
so as to receive the parts. or caps a¹ and a
In Fig. 5 the globe is divided longitudinally the edges being bevelled as
shewn in Fig. 6 which is a section of Fig. 5 on line to form the necessary
bearing surfaces or if preferred these may be made by flanging the two halves.
Each part or half a a¹ is here formed with a portion or half of a neck b¹ at
either end such neck portions having projections on same. to form with the
body portions a a² grooves in which spring or other rings e may be placed or
which may carry the means for securing the parts together. The construction
affords a ready means of cleaning the globes avoids the risk of breakages and
renders the manufacture more economical.
It will be evident that the globes may be formed in many other shapes and
yet be within the scope of the invention.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, we declare that
what we claim is:-
1. A carbon enclosing globe for electric arc lamps formed in two parts or
halves substantially as and for the purpose described.
2. A carbon enclosing globe for electric arc lamps formed with a separate
cap portion or portions substantially as and for the purpose described.
Dated this 19th day of August 1899.
PHILIP M. JUSTICE.
55, and 56, Chancery Lane, Chartered Patent Agent,
For the Applicant.