Improved Means and Appliances connected with Air-tight Electric Arc Lamps.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Improved Means and Appliances connected with Air-tight Electric
Arc Lamps.
I, JOHN JAMES RATHBONE, of 111, Messina Avenue, West Hampstead, London,
Electrician, do hereby declare the nature of this invention to be as follows:
This invention relates to bottle electric arc lamps in which the carbons are
enclosed in a glass or globe and as far as possible made airtight.
For the purposes. of my invention I prepare a glass or like bottle or globe
chimney or other in the upper part of which I arrange and fix the upper carbon
pencil. The neck of this bottle, globe or chimney carries say a metallic tube
insulated or not as desired from the lower carbon pencil which is within and is
guided by an inner tube, said carbon or pencil being upon a central core or
solenoid surrounded by a magnet or shunt coil, single or double as desired.
The lower end of this core is by a light flexible chain connected to the bottom
plate of the lamp which for my purpose serves as one of the pole plates; the
socket of the upper carbon capping or clip being the other pole.
The light flexible chain connection is of importance in this invention because
its flexibility permits of the lower carbon rising proportionately to the con-
sumption without breaking the current and the solenoid preserves the regularity
of the arc distance of the carbon points.
The light flexible chain or its equivalent may be used in conjunction with
mercury in the base of the lamp or alone as found necessary.
H. GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said J. J. Rathbone.
Improved Means and Appliances connected with Air-tight Electric
Arc Lamps.
I, JOHN JAMES RATHBONE, of 111, Messina Avenue, West Hampstead, London,
Electrician, 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:-
-
This invention relates to bottle electric arc lamps in which the carbons are
enclosed in a glass or globe, and as far as possible made air-tight.
For the purpose of my invention I prepare a glass or like bottle or globe
chimney in the upper part of which I arrange and fix the upper carbon
pencil. The neck of this bottle, globe or chimney carries say a metallic tube

page_text: insulated or not as desired from the lower carbon pencil which is within and is
guided by an inner tube or carbon holder acting as a central core of a solenoid.
The lower end of this core is by a light flexible chain or wire connected to the
bottom plate of the lamp, which for my purpose may serve as one of the pole
plates; the socket of the upper carbon capping or clip being the other pole.
The light flexible chain or wire connection is of importance in this invention
because its flexibility permits of the lower carbon rising proportionately to the con-
sumption without breaking the current and the solenoid preserves the regularity
of the arc distance of the carbon points.
The light flexible chain or its equivalent may be used in conjunction with
mercury in the base of the lamp or alone as found necessary.
My invention is illustrated in the sectional elevations on the annexed drawings
in which Figure 1 is an arrangement in which a light flexible connection of the
lower carbon holder with the metallic tube is employed:
Figure 2 showing a mercury connection in lieu of the flexible connection.
According to Figure 1, the upper carbon a is fixed in an air-tight manner in a
socket screwed into the metallic capping c on which is mounted the terminal d.
The bottle globe e is supported and fixed air-tight between the capping e and
a gallery f forming part of the metallic tube g which is enclosed within an outer
casing having an enlarged portion for the reception of a shunt coil j covered
by a cap k.
The lower carbon is fixed in a tubular carbon holder m' serving as a central
iron core which is acted upon by the shunt coil j in proportion to the strength of
the current passing through said coil determined by the degree of resistance of
the arc between the carbons in the well known manner.
In Figure 1, this tubular holder m is in electrical connection with the metallic
tube by means of a light flexible chain or wire n at the lower end, but in
Figure the electric connection is effected by mercury in which the lower
carbon holder m is supported, or floats under the attraction of the electro magnet.
The iron carbon holder m has a small opening m¹ at the base to allow the
mercury or its equivalent to slowly enter the holder and act as a dashpot.
The path of the main circuit will be readily traced from the drawings: it passes
from the terminal 7 and traverses tube g, chain n, (or mercury » Figure 2) holder m
lower and upper carbons and a, socket b, capping e, to the pole or terminal d.
The shunt circuit is from terminal q through coil j, along wire r to the terminal d.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is:
1. In an electric arc lamp in which the carbons burn within an air-tight globe
or chimney, the combination of a lower carbon holder in the form of a central
core partly supported or not by a liquid and acted upon by a shunt coil surrounding
a guide tube, a flexible chain or wire connection of central core and guide tube,
the latter supporting an air-tight globe, an air-tight capping fitted with screw
socket upper carbon holder above said globe, all as described and substantially
as shown on the annexed drawings.
2. In an electric arc lamp of the kind referred to, a lower carbon holder in the
form of a central core of a solenoid supported in mercury, provided with an
opening and acting as a dashpot in the manner described and substantially as
shown in the annexed drawings:
R. CORE GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said John James Rathbone.
R. CORE GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said John James Rathbone.