An Improved Resonant or Telephonic Pedestal or Support for Pianoforte Castors and the like.
Year: 1894

page_text: Date of Application, 22nd Mar., 1894
Complete Specification Left, 20 h Dec., 1894-Accepted, 2nd Feb., 1895
An Improved Resonant or Telephonic Pedestal or Support for
Pianoforte Castors and the like.
I FRANÇOIS LOUIS GOULVIN of 1 Rue de la Gare, Valence, in the Department
of Drôme, France, Manufacturer do hereby declare the nature of this invention to
be as follows:-
--
The object of this invention is to increase the resonant qualities of the pedestals
or supports which are or may be placed under the castors or feet supporting such
musical instruments as pianofortes, and it consists in constructing such pedestals
or supports so that they contain resonant or vibratory diaphragms adapted to
influence a magnetic field, which may further if desired be utilized for telephonic
purposes.
The improved pedestal consists of a suitably shaped body for instance of cast
iron terminating below in four or other number of legs or feet to rest upon the
ground and made hollow. In the inside of this body is a cross plate carrying a
central vertical rod of magnetized steel, and at a suitable distance above the said
cross plate is an interior flange carrying a resonant or vibratory diaphragm and -
above the latter a wooden socket piece on which the pianoforte castor or foot is
supported. Surrounding the magnetized bar is a reel of insulated wire the ends of
which are carried down into or through a wooden plate closing the body below.
If desired these wires may be connected to a similar instrument to operate as a
telephonic apparatus, the said instrument being similar in general construction but
not necessarily so in the form or material of which the body is composed since the
latter in the pedestal above described must be of a nature to support the weight
which it will have to carry.
Dated this 22nd day of March 1894.
R. HADDAN.
Agent to Applicant.
An Improved Resonant or Telephonic Pedestal or Support for
Pianoforte Castors and the like.
I FRANÇOIS LOUIS GOULVIN, of 1 Rue de la Gare, Valence, in the Department
of Drôme, 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:-
The object of this invention is to increase the resonant qualities of the pedestals
or supports which are or may be placed under the castors or feet supporting such
musical instruments as pianofortes, and it consists in constructing such pedestals
or supports so that they contain resonant or vibratory diaphragms adapted to
influence a magnetic field which may further if desired be utilized for telephonic
purposes.
The improved pedestal consists of a suitably shaped hollow body for instance of

page_text: cast iron terminating below in four or other number of legs or feet to rest upon the
ground. In the inside of this body is a cross plate carrying a central vertical rod
of magnetized steel, and at a suitable distance above the said cross plate is an
interior flange carrying a resonant or vibratory diaphragm and above the latter a
wooden socket piece on which the pianoforte castor or foot is supported.
Surrounding the magnetized bar is a reel of insulated wire the ends of which are
carried down into or through a wooden plate closing the body below.
If desired these wires may be connected to a similar instrument to operate as a
telephonic apparatus, the said instrument being similar in general construction but
not necessarily so in the form or material of which the body is composed, since the
latter in the pedestal above described must be of a nature to support the weight
which it will have to carry.
This telephonic or resonant pedestal is shown in the annexed drawing in which
Fig. 1 is a vertical sectional view thereof on the line V-X of Fig. 2.
Fig. 2 a plan view of the same.
Fig. 3 a vertical sectional view on the line Y-Z of Fig. 4 of the telephonic
receiver.
Fig. 4 a plan view of the same.
The telephonic or resonant pedestal and the receiver are here each composed of
a box or outer case or framing B of cast iron the one ending below in four legs b
and the other in the form of a bell. Each has at its upper part inside the said case
or frame a circular projection a cast in one piece with the outer framing in parallel
plane with the above mentioned projection a; a horizontal cross bar C is arranged
in the centre of which is screwed a vertical rod D. This rod, consisting of
magnetized steel, is provided with a coil E of copper wire insulated with silk or
otherwise; the extremities of this wire are fixed in a thin wooden disk H the latter
closing the apparatus at its bottom.
Upon the projection or inner rim a rests a circularly shaped vibratory plate F of
thin sheet iron, covered and protected by a top piece G of wood having a large
conical hole in its centre.
The receiver represented in Figs. 3 and 4 of the annexed drawing consists of
analogous constituent pieces which are marked with the same letters of reference.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
The improved auxiliary sounding device for pianos and similar instruments with
or without telephonic receiver attached thereto, comprising a metallic outer framing
having in its upper part an interior projection and in its lower part a cross bar, a
vertical rod of magnetized steel carried by said cross bar and carrying an electro
magnetic coil, a wooden disc closing the device below, a metallic vibratory plate
resting upon the said projection and a wooden top piece or crown, the latter
provided with a hole in its centre combined substantially as set forth.
Dated this 90th der of December 1894.
R. HADDAN,
Of the Firm of Herbert Haddan & Co.,
18, Buckingham Street, Strand, London, W.C.,
Agent to Applicant.
R. HADDAN,
Of the Firm of Herbert Haddan & Co.,
18, Buckingham Street, Strand, London, W.C.,
Agent to Applicant.