Year: 1897

page_text: We, WILLIS NELSON STEWART, Electrical Engineer, FRED BEANLAND and JOHN
WILLIAM PERKIN, Engineers and Contractors, all of the Prudential Buildings,
Park Row, in the City of Leeds, do hereby declare the nature of this invention
to be as follows:-
-
This invention refers to improvements in are lamps used for street lighting,
public rooms and the like, and has for its principal object to reduce the length
required for the lamp, so that such improved lamp is of a more generally conve-
nient size, and lends itself better to external artistic treatment. The invention
at the same time affords a very convenient means for steadying the regulation of
the lamp.
This invention consists in providing two rack rods instead of one in connection
with the regulating mechanism, the mechanism (gear wheels etc.) being duplicated
where required. These rack rods are placed preferably symmetrically on opposite
sides in the upper part of the lamp, and connected at their upper ends with a
stiff cross or bridge piece. The lower carbon holder is carried from an insulated
bridge or cross piece, attached to the lower ends of two hollow vertical supporting
or suspension rods. These rods are open at their upper ends, and are respectively
in line with the above mentioned rack rods; so that as the latter lower to suit the
burning away of the carbons, they enter and disappear telescopically within the
hollow suspension rods. It will be evident, that as compared with an arc lamp
in which the lower end of the rack rod cannot descend beyond the upper side of
the reflector plate, a lamp constructed in accordance with this invention can be
made shorter by the movement of the rack rods. Or should the same length of
lamp be retained, correspondingly longer rack rods and carbons can be employed,
so that the lamp will burn a correspondingly longer time.
The invention further comprises the fitting of pistons or plungers to the lower
ends of the rack rods, said pistons or plungers fitting the interior of the hollow
suspension rods, which are closed at their lower ends, thus constituting a pair of
dash pots for steadying the regulation of the lamp.
J. CLARK JEFFERSON,
30, Park Row, Leeds.
Agent for Applicants.

page_text: Improvements in Arc Lamps.
We, WILLIS NELSON STEWART, Electrical Engineer, FRED BEANLAND and JOHN
WILLIAM PERKIN, Engineers and Contractors, all of the Prudential Buildings,
Park Row, in the City of Leeds, 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 refers to improvements in are lamps used for street lighting,
public rooms and the like, and has for its principal object to reduce the length
required for the lamp; so that such improved lamp is of a more generally conve-
nient size, and lends itself better to external artistic treatment. The invention
at the same time affords a very convenient means for steadying the regulation of
the lamp.
This invention consists in providing telescopic rack rod or rods in place of the
ordinary single one, in connection with the regulating mechanism; the mechanism
(gear wheels etc.) being duplicated where required. These rack rods are placed
preferably symmetrically on opposite sides in the upper part of the lamp; and
connected at their upper ends with a stiff cross or bridge piece. The lower carbon
holder is carried from an insulated bridge or cross piece, attached to the lower
ends of two hollow vertical supporting or suspension rods. These rods are open
at their upper ends, and are respectively in line with the above mentioned rack
rods; so that as the latter lower to suit the burning away of the carbons, they
enter and disappear telescopically within the hollow suspension rods. It will
be evident, that as compared with an are lamp, in which the lower end of the rack
rod cannot descend beyond the upper side of the reflector plate, a lamp constructed
in accordance with this invention can be made shorter by the movement of the
rack rods. On the other hand, should the same length of lamp be retained, corres-
pondingly longer rack rods and carbons can be employed, so that the lamp will
burn a correspondingly longer time.
The invention further comprises the fitting of pistons or plungers to the lower
ends of the rack rods, said pistons or plungers fitting the interior of the hollow
suspension rods, which are closed at their lower ends, thus constituting a pair of
dash pots for steadying the regulation of the lamp.
And in order that our Invention and the manner in which the same is to be
performed may be more readily and clearly understood, we have annexed hereto
the accompanying drawing, of "so much of an arc lamp, (to which our invention
has been applied), as is necessary to illustrate our invention.
A is the top carbon holder, connected by means of the central rod b with the
cross piece or bridge c. The rack rods d, and d₂ are carried respectively from the
outer ends of the cross piece or bridge c.
9 are
The lower carbon holder is carried from, or formed as a socket e, in the cross
piece or bridge f. The lower ends of the hollow suspension rods Ir and
screwed, or otherwise secured, respectively to the outer ends of the cross piece or
bridge f.
The internal diameter of the hollow suspension rods 1 and 2 is somewhat
larger than the outer diameter of the rack rods d, and d, so that the latter can
move up and down within the former without friction.
The necessary insulation may be effected at any of the junctions as found most
convenient.

page_text: The means for moving either one or both of the carbon holders form no part of
our invention, and since any ordinary suitable means for this purpose may be
employed, and no representation on the drawing or description of such is necessary
to show the manner in which our said invention is to be performed, such repre-
sentation and description are omitted.
Also it will be evident, if an internal collar be fitted at the upper end of the
hollow rod g₁, to serve as a guide for the rod ; or if other equivalent guide be
provided that the rods d₂ and 9, may be dispensed with. We prefer however the
symmetrical double arrangement as shewn.
:
Further it will be evident, that the movement of one or both the carbons may be
effected by other than rack mechanism, as for example, both the upper and lower
rods d₁₂ and 91 92 may be suspended by chain or wire from drums, and the move-
ment effected by gravity, i.e. by making the rods d, and d₂ heavier than the
rods 91 and Ig. We do not wish therefore to limit our telescopic arrangement of
rods to rack rods only.
When, for the purpose of steadying the regulation of the lamp, it is desirable
to have a dash pot device in connection with the regulating mechanism, we provide
such by closing or plugging up the lower ends of the hollow rods g₁ and g₂ at
, and, and enlarge the lower ends of the rods d₁ and d as shewn at h₁ and h₂,
so as to form plungers, fitting the interior of hollow rods g, and sufficiently
closely for this purpose.
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. In are lamps the employment of a telescopic device connected to the carbon
holders substantially as and for the purposes herein set forth.
2. In are lamps the combination of rack rods d₁ and d, connected by the cross
piece c to the top carbon holder with the hollow rods g, and 2 connected to the
lower carbon holder by the cross piece or bridge f substantially as and for the
purpose or purposes herein set forth and illustrated.
3. In arc lamps the modification of the subject matter of Claims 1 and 2 in
which the lower ends of the internal rods are formed as or provided with plungers
fitting sufficiently closely the interior of the hollow rods, closed at their lower ends,
substantially as and for the purpose herein set forth.
Dated this 10th day of February 1898.
J. CLARK JEFFERSON,
30, Park Row, Leeds.
Agent for Applicants.