Improvements in Electric Incandescent Lamps.
Year: 1894

page_text: Date of Application, 2nd July, 1894
Complete Specification Left, 15th Mar., 1895-Accepted, 18th May, 1895
Improvements in Electric Incandescent Lamps.
We ALBERT ZOBEL and FRITZ BUCHMÜLLER, both of Pilotzstrasse 7, Munich
in the Empire of Germany, Merchants, do hereby declare the nature of this
invention to be as follows:-
It is known that incandescent lamps when they have attained their determined
duration of burning will have lost at 2 watts an equivalent of about 500 burning
hours, at 3 watts of about 800, at 34 watts of about 1000 burning hours of their
lighting power and that they will thus have caused a large consumption of electric
current above the light emitted.
In order now to offer to the user the opportunity of utilizing his lamps in such a
manner that on the occurring of a decrease of lighting effect he may be enabled to
connect a second filament in place of the first, the present improvement in such
incandescent lamps with replaceable filament consists therein that one of the
connecting wires belonging to one of the filaments is not as heretofore soldered onto
the setting but like the connecting wire of the other or replacing filament it projects
out of the basis of the lamp so as to be capable of being connected to and discon-
nected from the contact plate so that the similar connecting wire for the supple-
mentary or replacing filament may more easily replace it. The contact plate is
provided with a slot or hole to receive said wire.
Thated this 2nd do of July, 1801
R. HADDAN,
Agent for the Applicants.
We ALBERT ZOBEL and FRITZ BUCHMÜLLER both of Pilotzstrasse 7 Munich
in the Empire of Germany 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 is known that incandescent lamps, as they attain the limit of their determined
duration of burning namely about 500 burning hours for two and a half Watt
lamps, about 800 hours for 3 Watt lamps and about 1000 hours for three and a half
Watt lamps, lose a proportion of their lighting power and that they will thus cause
a large consumption of electric current above the light emitted.
In order now to offer to the user the opportunity of utilizing his lamps in such a
manner that on the occurring of a decrease of lighting effect, he may be enabled to
connect a second filament in place of the first in such incandescent lamps with
replaceable filament, we have provided an improved construction which is illustrated
in Fig. 2 of the annexed drawing, representing a transverse section through the
setting of the lamp, whilst Fig. 1 is an levation of such incandescent lamp; and
Fig. 3 represents the method of connecting such incandescent lamp-provided with
this improved arrangement-by means of the connecting wires III, IV with the
electric circuit I, II.

page_text: In this improvement one of the connecting wires, belonging to each of the
filaments a, b, namely the wires 2 and 3, is not as heretofore soldered on to the
setting but like the connecting wire of the other or replacing filament, it projects
out of the basis of the lamp so as to be capable of being connected to and discon-
nected from the contact plate W as shown for wire 3, so that the similar connecting
wire 2 for the supplementary or replacing filament a may more easily replace it.
The contact plate is provided with a slot or hole to receive said wire.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, we declare that what we
claim is ;-
In an electric incandescent lamp the combination with a replacing filament u of
the connecting wire 2, which is not soldered on to the setting of the lamp, but
projects out of the lamp, so as to be capable of being connected with the circuit
plate by bending it in the required direction; substantially as set forth.
Dated this lɔth day of March 1895.
R. HADDAN,
Of the Firm of Herbert Haddan & Co.,
18, Buckingham Street, Strand, London, W.C.,
Agent for Applicants.