Improvements in the Tubes of Wind Instruments.
Year: 1888

page_text: Date of Application, 22nd June, 1888
Complete Specification Left, 22nd Feb., 1889-Accepted, 22nd June, 1889
PROVISIONAL SPECIFICATION.
Improvements in the Tubes of Wind Instruments.
I CARLO TOMMASO GIORGI, of 8 rue Cerretani, Florence, Italy, Gentleman' do
hereby declare the nature of this invention to be as follows:-
After determining the length and the diameter of a tube according to the character
and the fundamental tone of the instrument to which the invention is to be applied;
and after having established the vibrations of the "la" of the diapason desired, the
octave is divided into twelve parts in mean geometrical proportion, in which the 1st
is to the 2nd as the 2nd is to the 3rd, etc., as established in the works on physics.
On the line of division traced by the calculation an opening is formed having a
length half as long again as the diameter of the tube, so as to avoid all dangerous
influence of the column of air which is beneath; and it is extended to the exit of
the column of air, and if the openings are in the same direction it may be carried
to the next line of division, leaving only between the two a small bar to facilitate
the closing by means of stops or covers. This small bar may also be abolished by
suitably modifying the form of the closing stops which determine the different lengths
of tube to obtain the different notes.
I thus obtain all the half notes by the shortening of the pipe at the mathematical
point indicated by the theory of physics, and these half notes will consequently liave
an exact intonation, equality of sound, and homogeneity of character.
Fig. 1 shows a tube a, a, in which slots are formed at the divisions determined
by the calculation, necessary to obtain the different notes as above indicated, while
leaving simple small bars b, b1, 11, etc., at the place of the divisions.
Fig. 2 represents the same tube with the stops for closing the openings in order
to produce the different notes applied thereto.
These stops can be operated by any suitable system of springs and of finger levers,
the drawing only showing an example of the means by which the system may be
applied.
Figs. 3 and 4 represent the means for following the musical scale at will according
to the same proportions.
1000
ALLISON BROS.,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in the Tubes of Wind Instruments.
I, CARLO TOMMASO GIORGI, of 8 rue Cerretani, Florence, Italy, Gentleman, 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 :-
After determining the length and the diameter of a tube according to the character
and the fundamental tone of the instrument to which the invention is to be applied;
and after having established the vibrations of the "la" of the diapason desired, the
octave is divided into twelve parts in mean geometrical proportion, in which the 1st
is to the 2nd as the 2nd is to the 3rd, etc., as established in the works on physics.
On the line of division traced by the calculation an opening is formed having a
length half as long again as the diameter of the tube, so as to avoid all dangerous
influence of the column of air which is beneath; and it is extended to the exit of
the column of air, and if the openings are in the same direction it may be carried

page_text: to the next line of division, leaving only between the two a small bar to facilitate
the closing by means of stops or covers.
This small bar may also be abolished by suitably modifying the form of the closing
stops which determine the different lengths of tube to obtain the different notes.
I thus obtain all the half notes by the shortening of the pipe at the mathematical
point indicated by the theory of physics, and these half notes will consequently have
an exact intonation, equality of sound, and homogeneity of character.
Fig. 1 shows a tube a, a, in which slots are formed at the divisions determined by
the calculation, necessary to obtain the different notes as above indicated, while
leaving simple small bars b, b1, b2, etc., at the place of the divisions.
Fig. 2 represents the same tube with the stops for closing the openings in order to
produce the different notes applied thereto.
These stops can be operated by any suitable system of springs and of finger
levers, the drawing only showing an example of the means by which the system may
be applied.
Figs. 3 and represent the means for continuing the musical scale at will by
following the same proportions, that is to say, for instruments requiring a greater
number of notes to be produced, the musical scale may be prolonged indefinitely, the
distances between the bars always increasing proportionately.
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 :-
The division of tubes of wind instruments in a musical scale formed with scientific
and technical proportional divisions according to the laws of physics.
Dated this 22nd day of February 1880
ALLISON BROS.,
Agents for the Applicant.