An Improved Automatic Fire-alarm.
Year: 1895

page_text: Date of Application, 27th Sept., 1895
Complete Specification Left, 23rd Oct., 1895-Accepted, 23rd Nov., 1895
An Improved Automatic Fire-alarm.
We, GUSTAV ADOLF LYNCKER, Lieutenant (Retired List), of Schleissheimer-
strasse 94, and ANTON SCHROPP, of no occupation, of Schwindstrasse 26, both of
Munich, in the Empire of Germany, do hereby declare the nature of this invention
to be as follows:-
The invention described in the present Specification consists of a simple
apparatus, by means of which (if the same is situated at the right place in a room)
an outbreak of fire may be detected there and signalled by an electric alarm-
apparatus to any required spot.
On a board of suitable form, a U shaped glass-tube is fitted in such a manner as
to stand away from the board about 2 cm. This tube has one arın longer than the
other and the longer arm is closed above whilst the shorter arm remains open.
In a temperature of 15 to 17° C., a certain quantity of chemically pure quicksilver
is inserted carefully into the tube so as to obtain the same amount of quicksilver in
each side of the tube so that in the longer arm a normal volume of air remains.
In the open part of the tube is inserted a piston easily movable, therefore not
tight fitting, made of some material not conductive of electricity, in which pistou
are contained two insulated platinum wires which end in equally long points
respectively and are fixed above to electrically conductive wires.
Whilst the piston has below a somewhat conical form its upper end is fitted with
a screw-thread where a bearing-rod is screwed in. The latter has above a flat
thread and can be raised or lowered by means of suitable adjustment gear.
Above the apparatus itself is fixed a very finely woven protecting netting to
protect it against accidents and to keep off the dust and same can be easily
attached to or detached from the board. A protecting roof is fitted for the
same purpose and moreover keeps off or retains the hot air that may enter the
apparatus.
If the apparatus is fitted in the right place (to be determined by the circulation
of air currents in the room) conducting wires need only be inserted into its binding
posts to establish the connection with any desired battery and series of alarm-bells
which can be obtained by simple connection in any house or building fitted with
electric bells, telephone or the like. After this it will only be required to adjust
the platinum points to about 2-5 to 3 m.m. from the surface of the quicksilver.
On the outbreak of a fire the heated air will pass round the apparatus, and the
normal air shut in by the quicksilver will expand by the heat imparted to it as well
as by its own expansion tendency (for the outer air above the quicksilver will
become thinner and lighter) and thus expanding it will drive the quicksilver to
the platinum-points. Electrical contact is thus closed and the alarm-bells set in
action.
Dated this 27th day of September 1905.
HERBERT HADDAN & Co.,
Agents to Applicants.

page_text: +
An Improved Automatic Fire-alarm.
We, GUSTAV ADOLF LYNCKER, Lieutenant Retired List, of Schleissheimer-
strasse 94, and ANTON SCHROPP, of no occupation, of Schwindstrasse 26, both of
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 :-
The invention described in the present Specification consists of a simple apparatus
by meaus of which (if the same is situated at the right place in a room) an outbreak
of fire may be detected there and signalled by an electric alarm apparatus to any
required spot.
On a board A of suitable form a U shaped glass tube B is fitted in such a manner
as to stand away from the board about two centimeters. This tube has one arm
longer than the other, and the longer arm, as shown in the drawing, is closed above
at whilst the shorter arm remains open at d.
In a temperature of 15 to 17 degrees C., a certain quantity of chemically pure
quicksilver is inserted carefully into the tube so as to obtain the same amount of
quicksilver in each side of the tube as shown in the drawing (9, q¹) so that in the
longer arm a normal volume of air remains.
In the open part of the tube B is inserted a piston f easily movable, therefore not
tight fitting, made of some material not conductive of electricity, in which piston
are. contained two insulated platinum wires g and gl which end in equally long
points and k¹ respectively and are fixed above to electrically conductive wires by
bindin screws d and i.
Whilst the piston has below a somewhat conical form its upper end is fitted with
a screw thread
where a bearing rod is screwed in. The latter has above a flat
thread and can be raised or lowered by means of suitable adjustment gear
consisting of bevelled gear m, n, rod o and milled head r. To the posts i and are
fitted two spiral conducting wires o¹ and o² which run past the glass tube to the
posts & and s fitted or the board.
Over the apparatus itself is fixed a very finely woven protecting netting t to
protect it against accidents and to keep off the dust and same can be easily attached
to or detached from the board A. A protecting roof u is fitted for the same
purpose and moreover keeps off or retains the hot air that may enter the apparatus.
If the apparatus is fitted in the right place (to be determined by the circulation
of air currents in the room) conducting wires need only be inserted into its binding
posts sands to establish the connection with any desired battery and series of
alarm-bells which can be obtained by simple connection in any house or building
fitted with electric bells, telephone or the like. After this it will only be required
to adjust the platinum points k and to about 25 to 3 millimeters from the surface
of the quicksilver.
will
On the outbreak of a fire the heated air will pass round the apparatus and the
normal air shut in by the quicksilver will expand by the heat imparted to it as well
as by its own expansion tendency, (for the outer air above the quicksilver in
become thinner and lighter) and thus expanding it will drive the quicksilver to
the platinum points. Electrical contact is thus closed and the alarm-bells set in
action.
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 ;-
An electrical fire-call, consisting of a U formed bent glass tube B the longer
nart of which is closed near
whilst in the other end is inserted a niston 7

page_text: adjustable upwards and downwards by a driving gear r, o, n, e, m, in which piston
are fitted two conducting wires g, g' ending in points k and k¹ which are so fixed
that on a rising of the quicksilver in the arm of tube B contact is effected and the
danger will be signalled.
Dated this 23rd day of October 1895.
HERBERT HADDAN & Co.,
18, Buckingham Street, Strand, London, W.C., Agents to the Applicants.