System of Mounting Acoustic Trumpets to Phonographic Apparatus.
Year: 1897

page_text: Date of Application, 8th Mar., 1897
Complete Specification Left, 7th Dec., 1897-Accepted, 8th Jan., 1898
PROVISIONAL SPECIFICATION.
System of Mounting Acoustic Trumpets to Phonographic Apparatus.
I, HENRI JULES LIORET, of 18 Rue Thibaud, Paris, France, Manufacturer, do
hereby declare the nature of this invention to be as follows:-
This invention relates to a system of mounting acoustic trumpets which are
adapted to the resonators of phonographic apparatus in order to enable the sounds
to be heard by a large number of people at the same time. My invention is
applicable to any phonographs in which a displacement of the stylus and of the
resonator corresponds to the advance of the phonographic inscription; in the
following description I will first as an example suppose the trumpet applied to a
cylindrical phonograph, the cylinder of which only turns on its axis, whilst the
stylus and the resonator move about parallel to this axis, as takes place in the
system of phonograph described in my prior British Patent No. 23366 dated
5th. December, 1893.
I would point out that in this system the phonogram is inscribed on the bottom
of a screw thread which is formed on the surface of the cylinder, and that the
stylus and the resonator are carried freely forward by this screw thread about
parallel to the axis while turning round the fixed centre of oscillation.
It is therefore necessary that the resonator and its trumpet, while being well
supported, be capable of great liberty of movement to readily follow the stylus
and it is in order to fulfil these conditions that I have been led to devise the system
of mounting of acoustic trumpets which forms the object of the present applica-
tion. It consists essentially in supporting the trumpet, at a point near its centre
of gravity by the intermediary of a universal joint which gives it perfect liberty
of movement, and to attach the narrowest end of this trumpet, by a flexible con-
nection, to the resonator.
The trumpet which may be of any suitable material such as wood, metal, card-
board, etc., is mounted by trunnions in a stirrup so as to be capable of oscillating
freely round the horizontal axis formed by the trunnions; the stirrup is provided
with a tail or stem which can turn freely on its vertical axis in a tube on the
upper end of which the arms of the stirrup rest freely. The vertical tube is fixed
to a horizontal rod which fits in a tube attached to the frame of the phonograph.
A binding-nut mounted on the screw threaded and split end of the tube attached
to the frame permits such split end to be bound tightly on the rod so as to fix the
latter firmly in any position to which it has been moved.
As the trunnions are placed slightly above the centre of gravity of the whole
part constituted by the trumpet and the resonator, it will be seen that the stylus
rests by itself in the screw thread of the cylinder; the pressure with which it
bears on the bottom of the screw thread may further be determined at will by
suitably arranging the position of the trunnions.
The arrangement above described gives to the trumpet and to the resonator
complete liberty of movement in all directions, which is indispensable for obtaining
a good reproduction of the sounds registered on the cylinder. The vertical axis
of rotation permits the resonator and the trumpet to readily follow the stylus when

page_text: it is displaced laterally by reason of its engagement with the screw thread of the
cylinder, and the horizontal axis permits of the up and down movements on the
reliefs and hollows of the phonogram; it also permits of the removal of the stylus
from the cylinder when it is not desired to cause the apparatus to speak.
The flexible connection establishes between the resonator and the trumpet an
attachment having no rigidity which increases the freedom of movement and
avoids the vibrations and resistances which would be produced if the connection
were made by metal against metal for example; it also permits of the adjustment
being effected.
Finally, as the rod carrying the tube in which the tail or stem of the stirrup is
inserted is mounted so that it can be moved in its support, same may be caused
to enter within the tube to move the trumpet towards the centre of the apparatus
so that the latter occupies less space either for transport, or for enclosing it in a
box or under a cover.
It will be further understood that the trumpet arranged as above described will 1
just as well follow the registered phonogram when same is made in a spiral form
on a revolving plate, as when it is made in the form of a helix on a cylinder; the
invention therefore as above stated is applicable to all forms of phonographic
apparatus in which a displacement of the stylus corresponds to the advance of the
phonographic inscription, and notably to grammaphones in which the inscription 2
is made in spiral form on a plate.
System of Mounting Acoustic Trumpets to Phonographic Apparatus.
I, HENRI JULES LIORET, of 18, Rue Thibaud, Paris, France, Manufacturer, 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 relates to a system of mounting acoustic trumpets which are
adapted to the resonators of phonographic apparatus in order to enable the sounds
to be heard by a large number of people at the same time. My invention is
applicable to any phonographs in which a displacement of the stylus and of the
sonator corresponds to the advance of the phonographic inscription; in the
following description I will first as an example suppose the trumpet applied to a
cylindrical phonograph, the cylinder of which only turns on its axis, whilst the
stylus and the resonator move about parallel to this axis, as takes place in the
system of phonograph described in my prior British Patent No. 23366 dated
5th. December 1893.
I would point out that in this system the phonogram is inscribed on the bottom
of a screw thread which is formed on the surface of the cylinder, and that the
stylus and the resonator are carried freely forward by this screw thread about
parallel to the axis while turning round the fixed centre of oscillation.
It is therefore necessary that the resonator and its trumpet, while being well
supported, be capable of great liberty of movement to readily follow the stylus
and it is in order to fulfil these conditions that I have been led to devise the system
of mounting of acoustic trumpets which forms the object of the present applica-
tion. It consists essentially in supporting the trumpet, at a point near its centre
of gravity by the intermediary of a universal joint which gives it perfect liberty

page_text: of movement, and to attach the narrowest end of this trumpet, by a flexible con-
nection, to the resonator.
Fig. 1 of the accompanying drawings shows by way of example, the arrange-
ment which I have adopted for carrying out my system in the case supposed.
A indicates the phonograph and B its cylinder; C indicates the resonator which
may be of any suitable kind, and D indicates the connection of flexible material,
india rubber for example, uniting the resonator to the trumpet E.
The latter which may be of any suitable material such as wood, metal, card-
board, etc., is mounted by trunnions f in the stirrup F so as to be capable of oscil-
lating freely round the horizontal axis formed by the trunnions; the stirrup is
provided with a tail or stem F which can turn freely on its vertical axis in the
tube G on the upper end of which the arms of the stirrup rest freely. The vertical
tube G is fixed to a horizontal rod H which fits in a tube I attached to the frame
of the phonograph. A binding-nut J mounted on the screw threaded and split
end of the tube I permits such split end to be bound tightly on the rod H so as to
fix the latter firmly in any position to which it has been moved.
As the trunnions f are placed slightly above the centre of gravity of the whole
part constituted by the trumpet and the resonator, it will be seen that the stylus
rests by itself in the screw thread of the cylinder B; the pressure with which it
bears on the bottom of the screw thread may further be determined at will by
suitably arranging the position of the trunnions f.
The arrangement above described gives to the trumpet and the resonator complete
liberty of movement in all directions, which is indispensable for obtaining a good
reproduction of the sounds registered on the cylinder B. The vertical axis of
rotation permits the resonator and trumpet to readily follow the stylus when
it is displaced laterally by reason of its engagement with the screw thread of the
cylinder B, and the horizontal axis f f permits of the up and down movements on
the reliefs and hollows of the phonogram; it also permits of the removal of the
stylus from the cylinder when it is not desired to cause the apparatus to speak.
The flexible connection D establishes between the resonator and trumpet an
attachment having no rigidity which increases the freedom of movement and
avoids the vibrations and resistances which would be produced if the connection
were made by metal against metal for example; it also permits of the adjustment
being effected.
Finally, as the rod H is mounted so that it can be moved in its support, same
may be caused to enter within the tube I to move the trumpet towards the centre
of the apparatus so that the latter occupies less space either for transport, or for
enclosing it in a box or under a cover.
It will be further understood that the trumpet arranged as above described will
just as well follow the registered phonogram when same is made in a spiral form
on a revolving plate, as when it is made in the form of a helix on a cylinder; the
invention therefore as above stated is applicable to all forms of phonographic
apparatus in which a displacement of the stylus corresponds to the advance of the
phonographic inscription, and notably to grammaphones in which the inscription
is made in spiral form on a plate.
Fig. 2 shows the arrangement employed in this case, B indicating the plate on
which the registration, which the stylus c must freely follow, is made in spiral
form; as in the case of the arrangement shown in Fig. 1C indicates the resonator
of any suitable kind, which carries the stylus; D designates the attachment of
flexible material connecting the resonator to the trumpet E. Findicates the
stirrup in which the trumpet is trunnioned and the tail or stem F¹ of which can
turn freely in a tube G which is mounted in an adjustable manuer, on the frame
of the apparatus, in the same manner as in the arrangement previously described
or in an analogous manner.
The same system of mounting is applicable in the case where, on account of
the impossibility of increasing the length of the trumpet beyond a certain limit,

page_text: it is necessary to place as a continuation of this trumpet one or several other
independent trumpets.
In fact, if the length of the trumpet is increased to too great an extent, the only
result of this excessive increase in the length is to strengthen the useless and
insignificant sounds, so that if it is desired to obtain considerable strengthening,
it is requisite to arrange as a continuation of the first trumpet one or several other
separate trumpets, so as to thus constitute a kind of sectional trumpet.
Fig. 3 of the drawings represents an example of the construction, and shows two
independent trumpets thus placed as a continuation one of the other. It will be
seen that the supplementary trumpet E' freely engages the expanded end of the
main trumpet E; it is arranged and situated in such a way as to practically con-
stitute a prolongation of the latter. This auxiliary trumpet E is further mounted,
as I have already stated, in the same manner as the first, so that if desired it
permits of its axis being made to coincide exactly with that of the main trumpet E,
and to allow it free play. A chain K¹ is fixed to the stirrup F1 and being attached
to a hook e¹ of the trumpet E', retains the latter at the desired angle.
angle may be changed by attaching one or other of the links of the chain to the
hook e. The tube G¹ in which the stem of the stirrup 1 is mounted freely, is
carried by any suitable support L. A third trumpet might be mounted as a con-
tinuation of the second, as the second is a continuation of the first.
This
In this manner I obtain a strengthening of the sounds such that they may be
heard distinctly by all persons in a very large hall, where the phonograph is in
operation.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is:
-
1. The system of mounting acoustic trumpets for any form of phonographs,
grammaphones, etc., in which a displacement of the stylus and of the resonator
corresponds to the advance of the phonographic inscription, substantially as here-
inbefore described and as shown in Figs. 1 and 2 of the accompanying drawings.
2. The system of mounting acoustic trumpets for any kind of phonographs,
grammaphones, etc., in which a displacement of the stylus and of the resonator
corresponds to the advance of the phonographic inscription, with one or several
supplementary trumpets E', substantially in the manner and for the purpose
indicated, and as shown in Fig. 3 of the drawings.
3. In the mounting of either single or multiple acoustic trumpets for
phonographs, etc., of the kind specified in the first claim, the application of a
support with a universal joint F, F, G, f, f, which (in so far as the main trumpet E
is concerned), is carried by an adjustable rod H, substantially as and for the purpose
specified.
4. In the mounting of acoustic trumpets for phonographs, etc., of the kind
specified in the first claim, the application of a flexible connection D, substantially
as and for the purpose specified.
Dated this 7th day of December 1897