Improvements in and relating to Street Fire Alarms and their Combination with Telephones.
Year: 1891

page_text: Date of Application, 31st Mar., 1891
Complete Specification Left, 23rd Oct., 1891-Accepted, 31st Mar., 1892
PROVISIONAL SPECIFICATION.
Improvements in and relating to Street Fire Alarms and their
Combination with Telephones.
FRANCIS ELLIOTT STUART C.E. Volthurst Twickenham Expert in Fire
Telegraphs do hereby declare the nature of this invention to be as follows:-
These improvements consist essentially of a combination of ordinary telephones;
and automatic switches, with a street fire alarm system.
In the street fire alarm post or case, and at the receiving apparatus, I use an
automatic switch, on which hangs a telephone, which when the telephone hangs on
it, puts the line wire to the alarm at each end, so that the alarm can be used by
any-one breaking the glass, or other means.
When the door is opened, the ordinary signalling button is to be used, for
signalling the receiving station by a preconcerted number of rings to use the
telephone.
The operator then unhooks his telephone from the automatic switch which
switches the line wire off-the fire alarm apparatus of the particular fire alarm point
being used (without interfering with any of the other points) and puts the telephones
on to line thus completing the speaking circuit (the other telephones being connected
to earth) from the alarm point to the receiving station.
The flexible cord necessary for making the connections I arrange either with a
pulley-weight, or on a spring roller, to keep it out of the way, when not in use.
The weight can traverse inside the stem of the post.
It is essential that the telephone should only be accessible after opening the door
of the call-point.
The whole apparatus described forms my improvements in, and relating to street
fire alarms and their combination with telephones.
Dated this Thirtieth day of March 1891.
FRANCIS ELLIOTT STUART, C.E.,
Expert in Fire Telegraphs.
COMPLETE SPECIFICATION.
Improvements in and relating to Street Fire Alarms and their
Combination with Telephones.
FRANCIS ELLIOTT STUART C.E. Fire Brigade Electrician & Expert Volthurst
Twickenham 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 :--
According to my invention, I may have any number of street call points,
consisting of permanent magnet telephones in combination with an ordinary
electrical call transmitter suitably connected by a wire to the receiving or station
apparatus.
This combination is specially adaptable to the existing street fire alarms, or police
alarms; but can can be used with other apparatus.
At the receiving station of the electric call system I insert in the circuit by
meaus of a switch a complete telephone set, the said switch being either automatic
as in a telephone hook switch or kept down by manual interference, when con-
versation is carried on over the line. The switch at its normal position keeps
the line wire, or the wire from the coils of the call indicator; always in circuit

page_text: when the telephone is in use and connecting when at its normal position the call
system line wires to the call apparatus only, and when held down the telephone
apparatus to the particular line wire required.
Sixthly. The combination with each other of the various mechanical parts, and
electrical connections described above.
Dated this Twenty-second day of October in the year of our Lord Eighteen
hundred and ninety-one
FRANCIS ELLIOTT STUART,
Civil Engineer.