Improvements in the Construction of Sounding Boards.
Year: 1897

page_text: Date of Application, 9th Nov., 1897
PROVISIONAL SPECIFICATION.
Improvements in the Construction of Sounding Boards.
I, REGINALD HADDAN, of the firm of Herbert Haddan & Co., of 18, Buckingham
Street, Strand, London, Patent Agent, do hereby declare the nature of this
invention a communication to from abroad by Constantin Schmidtlein,
Engineer, of 22, Luisenstrass lin, in the Empire of Germany, to be as
follows:-
The present invention relates to sounding boards which are made without
strengthening ribs and more especially it relates to sounding boards according to
the Specification left with the Application for Letters Patent of my aforesaid
correspondent No. 23711 dated 14 October 1897.
In the said specification sounding boards are described and illustrated which are
composed of boards or plates of wood with the grain crossing one another, the said
boards gradually tapering or becoming reduced in thickness towards their margins
where immediately before their support they are reduced in thickness by making
a groove or diminution in thickness on each face.
According to the present invention these sounding boards may also be made
of boards or plates of equal thickness throughout except near their margins where
they are reduced in thickness by said grooves.
This reduction in thickness may occur through the provision of a groove or
grooves on one side only instead of on both sides, or such grooves may be on
both sides.
Where the plates or boards are gradually tapered or reduced in thickness towards
their margins the groove or grooves aforesaid may be on or in the one face of the
sounding board instead of on or in both faces.
Improvements in the Construction of Sounding Boards.
I, REGINALD HADDAN, of the firm of Herbert Haddan & Co., of 18, Buckingham
Street, Strand, W.C., London, Patent Agent, do hereby declare the nature of this
invention a communication to me from abroad by Constantin Schmidtlein,
of 22, Luisenstrasse, Berlin, Germany, Engineer, and in what manner the same is
to be performed to be particularly described and ascertained in and by the following
statement:-
The present invention relates to sounding boards which are made without
strengthening ribs and more especially it relates to sounding boards according to

page_text: the Specification left with the Application for Letters Patent of my aforesaid
correspondent No. 23711 dated 14 October 1897.
In the said specification sounding boards are described and illustrated which are
composed of boards or plates of wood with the grain crossing one another, the said
boards gradually tapering or becoming reduced in thickness towards their margins
where immediately before their support they are reduced in thickness by making
a groove of diminution in thickness on each face.
According to the present invention these sounding boards may also be made
of boards or plates of equal thickness throughout except near their margins where
they are reduced in thickness by said grooves.
This reduction in thickness may occur through the provision of a groove or
grooves on one side only instead of on both sides, or such grooves may be on
both sides.
When the plates or boards are gradually tapered or reduced in thickness towards
their margins the groove or grooves aforesaid may be on or in the one face of the
sounding board instead of on or in both faces.
This invention is illustrated in the annexed drawing, wherein Fig. 1 is a section
of part of a sounding board which is made up of two layers of wood, with the
grain crossing and made so that the board is of equal thickness throughout the
extent of its body up to near the margins where it is reduced in thickness imme-
diately in front of its support by the provision of a groove in each of its faces.
Fig. 2 shows the same sounding board but having a groove only in its upper or
front face. Fig. 3 shows the same board but having a groove only in its under or
rear face. Fig. 4 shows in section part of a sounding board in which the body of
the board is tapered gradually towards the support and is provided near the margin
with a groove only on the upper or front face. Fig. 5 shows a similar board but
having the groove only in the under or rear face.
A represents the sounding board, B the support thereof, C the groove or grooves
near the margin.
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:-
1. A sounding board comprised of superposed boards or plates of wood with the
giain crossing one another, such boards being of equal thickness throughout the
body of the sounding board, and up to near the margins thereof, where the sound-
ing board is provided with a groove in the one or in the other face or with grooves
in both faces in order to diminish the thickness of the sounding board immediately
before its support.
2. A sounding board composed of superposed boards or plates of wood with the
grain crossing one another and such that the sounding board is thicker in the
middie and tapers towards its margins where immediately before its support is, it is
provided with a groove in the one face only, such groove being in either of its
two faces.