Improvements in Electric Lighting by Incandescence Lamps Arranged in Series.
Year: 1894

page_text: Date of Application, 6th Mar., 1894
Tomplete Specification Left, 6th D:c., 1894-Accepted, 6th Mar. 1895
PROVISIONAL SPECIFICATION.
Improvements in Electric Lighting by Incandescence Lamps
Arranged in Series.
We THOMAS ROBERT BURRELL of Troutbeck Bridge Windermere in the
County of Westmoreland Electrician and FREDERIC FOWKES of Hawkshead
Ambleside in the County of Lancaster Electricity Supplier do hereby declare the
nature of this invention to be as follows:-
Our invention is for the purpose of reducing the probability of an extinction of
light when incandescence lamps are arranged in series (for street lighting and other
purposes) and for maintaining an unbroken electrical circuit in the event of the
failure of one or more lamps. In each lamp head or globe we place two or more
lamps so arranged that when the current is turned on one lamp will become ignited
the others being in reserve. Should the filament of the first lamp fail the current
will peirce a slip of paper or other suitable insulating material and ignite the
second lamp and so on to any desired number of lamps in succession. When all
the lamps have failed the circuit is established by similar means through a short
circuit or through a resistance or impedence coil representing the resistance of one
lamp.
Dated this 16th day of February 1894
THOMAS ROBERT BURRELL.
FREDERIC FOWKES.
Improvements in Electric Lighting by Incandescence Lamps
Arranged in Series.
We THOMAS ROBERT BURRELL of Troutbeck Bridge, Windermere in the
County of Westmoreland, Electrician, and FREDERIC FOWKES of Hawkshead,
Ambleside in the County of Lancashire, Electricity Supplier, 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 :-
Our invention is for the purpose of reducing the probability of an extinction of
light when incandescence lamps are arranged in series (for street lighting and other
purposes) and for maintaining an unbroken electrical circuit in the event of the
failure of one or more lamps. In each lamp-head or globe we place two or more
lamps so arranged that when the current is turned on one lamp will become
ignited the others being in reserve. Should the filament of the first lamp fail the
current will pierce a slip of paper or other suitable insulating inaterial and ignite
the second lamp and so on to any desired number of lamps in succession. When
all the lamps have failed the circuit is established by similar means through a short
circuit or through a resistance or impedence coil representing the resistance of
one lamp.

page_text: DESCRIPTION OF DRAWINGS.
In the accompanying drawings a diagram is shewn of two lamps and one
impedence coil or resistance arranged according to our invention. The current
enters by the line at 'A' and leaves by the line marked B. The two lamps are
marked 1' and '2' respectively and the resistance or impedence is marked '3.'
The contact pieces separated by pieces of paper or other semi-insulating material
are shewn at 'C' and 'D.'
The action of the apparatus is as follows:-
Should',
The current entering at 'A' passes through lamp No. 1 and out at B,' the
insulating pieces at "C" and "D' preventing it taking any other course.
however, the filament in lamp No. 1 fail the current then pierces the insulating
paper at 'C' and passes through lamp No. 2. In the event of the filament of lamp
No. 2 failing the current then pierces the insulating material at 'D" and passes
through the resistance or impedence marked '3' thus completing a circuit. ar 1
preventing the extinction of other lamps in series with those above described.
Having now described the nature of our invention and the manner of carrying
the same into effect:-
We claim the use of an automatic device substantially as described for
introducing spare lamps into an electric circuit with or without the final resistance
or impedence.
THE BRUSH ELECTRICAL ENGINEERING CO., LD.,
P. BROADHURST, Secretary,
Agents for Applicants.