IMPROVEMENTS IN ORGAN PIPES OR TUBES
Year: 1876

page_text: LETTERS PATENT to Edward Griffith Brewer, of Chancery Lane, London, for
the Invention of "IMPROVEMENTS IN ORGAN PIPES OR TUBES." A communi-
cation from abroad by Messrs. Gavioli and Company, of Paris, France.
PROVISIONAL SPECIFICATION left by the said Edward Griffith Brewer at the
Office of the Commissioners of Patents on the 20th July 1870.
"IMPROVEMENTS IN
EDWARD GRIFFITH BREWER, of Chancery Lane, London.
ORGAN PIPES OR TUBES." A communication from abroad by Mess. Cavioli and
Company, of Paris, France.
Numerous combinations or improvements have been heretofore proposed for the
pipes of organs so as to provide at the mouth a suitable valve or diaphragm.
This Invention refers to the arrangement of valves or diaphragms and the like
appliances for varying, dividing, or directing the emission of the wind so as to
modify or regulate the sounds or tones in such manner that, although obtained from
wind instruments, they approach those obtained from stringed instruments, like the
violin, for example.
According to this Invention the organ pipe may be of wood; there is an opening
composed of three parts, the emission being produced from the centre, and there is
a diaphragm which may be fitted or fixed above or below the opening; the
diaphragm, which may be called a harmonic brake, is composed of a blade forming
a portion of or connected to an elastic portion which is provided with apertures or
slots; the inclination of the blade is calculated so as to obtain an inclination of
sound, or its note in combination with the inclination of the opening. If it is
admitted that the angle produced by this blade is absolute in relation to the
emission of the wind, it is indispensable that the valve be elevated or lowered
regularly in the vertical direction. For this purpose slides are or may be provided
whereby the brake can be raised or lowered without altering its inclination to the
position of the blade, the position being regulated by means of screws.
The angle
of the blade may vary, but the important point is to be able to raise and lower the
diaphragm in a vertical direction, at the same time maintaining a determined angle
which may be modit ed as requirements may necessitate.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Edward Griffith Brewer in the Great Seal Patent Office on the 26th
January 1877.
EDWARD GRIFFITI BREWER, of Chancery Lane, London.
"IMPROVEMENTS IN
ORGAN PIPES OR TUBES." A communication from abroad by Mess. Gavioli and
Company, of Paris, France.
Numerous combinations or improvements have been heretofore proposed for the
pipes of organs so as to provide at the mouth a suitable valve or diaphragm.
This Invention refers to the arrangement of valves or diaphragins and the like
appliances for varying, dividing, or directing the emission of the wind, so as to
modify or regulate the sounds or tones in such manner that, although obtained from
wind instruments, they approach those obtained from stringed instruments, like the
violin, for example.
People who have studied this class of manufacture are aware that the slightest
variation is very important in the result obtained.
In Figure 1, a is an organ pipe, which may be made of wood; b is the opening or
light composed of the parts b, 61, and b, the emission being produced at b; c is the
diaphragm, placed as shown in the different Figures 1, 2, 3, 4, and 5.
Figure 1 is a geometrical diagram illustrating this principle or arrangement.
Figures 2 and
show a tube where the diaphragm is guided at its lower part,
and Figures 4 and 5 represent a diaphragm guided at its upper part. The diaphragin,
which may be called a harmonic brake, is composed of a blade c forming a portion
of or connected to an elastic portion c, which is provided with apertures or slots c²
and c³. The inclination of the blade c is calculated so as to obtain an inclination of
sound or its note in combination with the inclination of the opening. If it is
admitted that the angle produced by this blade is absolute in relation to the emission
of the wind, it is indispensable that the valve be elevated or lowered regularly in
the vertical direction. For this purpose slides and c³ are or may be provided
whereby the brake or blade c can be raised or lowered without altering its inclination
to the position of the blade, the position being regulated by means of screws c¹.
The angle of the blade may be, owing to its flexibility, varied, but the important
point is to be able to raise and lower the diaphragm in a vertical direction, at the
same time maintaining a determined angle which may be modified as requirements
miny necessitate.
Having now described the nature of the said Invention, and in what manner the
same is to be performed, I declare that I claim as the improvements in organ pipes
or tubes, the diaphragm or "harmonic brake," illustrated in the Drawing by the
letter c, its object being to present an obstacle to the emission of the wind for
regulating or modifying the tones of the instrument so as to resemble those produced
from stringed instruments, the brake or valve being capable of being raised or
lowered vertically in order to be able to vary or regulate the tones of the instrument
as required, all substantially in the manner described and with reference to the
accompanying Drawings.
In witness whoreof, I, the said Edward Griffith Brewer, have hereunto set my
hand and seal, this Twenty-sixth day of January, in the year of our Lord One
thousand eight hundred and seventy seven
E. G. BREWER. (L.S.)