Improvements in Organs Constructed on the Tubular Pneumatic Principle.
Year: 1889

page_text: COMPLETE SPECIFICATION.
Improvements in Organs Constructed on the Tubular Pneumatic
Principle.
I, CHARLES FREDERICK BRINDLEY of Havelock Square, Sheffield in the County
of York, Organ Builder, 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 of improvements in Organs worked or operated on the pneumatic
principle, relates chiefly to the pipe-chest, medium-chests pneumatic couplers and
reducing bars, and has for its object to obtain from a smaller number of pipes, the
greatest possible variety, and harmonic effect with a reduction of space, and economy
in the first cost.
To render my specification clear and readily understood by those skilled in the art
of Organ building, I have annexed sheet of sectional diagrams illustrating my
invention.
The Pipe-chest A, being the part upon which the speaking pipes B stand, is con-
structed with as many divisions C, as there are families of tone, and in each of such
divisions are placed as many pipe-valves and bellows, as there are tones required; or
instead of one large division there may be two smaller ones.
The pipes will be placed on an upper-board of ordinary construction fitted on the
top of each division as shown.
Under the holes D, in the upper-board through which the wind passes to the
pipes B, fix valves E, with bellows F, preferably of the oblong shape as shown, and
I attach to the bellows or to the side of the division as may be most convenient a
spring G, to assist its action. The Bellows is worked by a supply and exhaust
valve H.
The Medium-Chest M and M', supplies the motive force to the exhaust and supply
valve H, the said Medium Chest being constructed as follows: I make a box having
as many air channels I, as there are notes, and on the bottom side of the channel I,
I place as many valves J, as may be necessary to obtain the number of amplified
stops specified for.
Governing the wind supply and placed at the mouth of the channel I, I fix a
double acting valve K. At the base of the valve J, is attached a disc which is
operated upon by a strip of leather V, secured over the compartment, which
compartment has wind admitted to it by a valve in connection with the drawstop
neither of which are shown in the drawing. In the illustration all stops are
supposed to be "drawn" on putting in a stop the air is admitted to the com-
partment 1, and the leather V, lifting the discs at the base of the valve 1, closes
the opening above it and prevents the wind from the channel I, entering the tube
with which it is in connection.
On the other hand when no wind is in the compartment L, the valves J rest upon
their lower surface and permit a free passage to the wind from the channel I.
The coupler boxes N, O, P, are constructed on precisely the same principle as
the Medium-Chest and work in the same manner; they derive their motive force
from the key valve not shown.
In order to avoid unnecessary tubes and chambers, I employ a series of reducing
bars Q, which consist of two pieces of wood R, with packing S, between them; in
the said packing I cut a channel T, and place therein a
"blow to" valve W con-
structed as follows; I take a thin piece of wood or metal and face it on each side
with leather, and attach it by a free hinge of leather or other material, at the heel.
I make corresponding holes in the pieces of wood R, one above and the other below
the "blow to" valve, and I also provide another hole not connected with or closed by
the valve.

page_text: The blow to valve closes one or other of the two holes in connection with it,
according to the course of the wind which is admitted to the reducing bar.
The hereinbefore described system, and the method of carrying it into practice,
in the Pipe-Chest, Medium Chests, Pneumatic Couplers, and reducing bars of Organs
built on the Tubular pneumatic principle is novel and original and I am enabled
thereby to obtain the greatest variety of tone from a given number of pipes; for
example, by adding to a Lieblich Gedact 8 ft. tone, au extra octave of pipes to bottom,
and an extra octave to top, I am abled to get. two additional stops, namely Lieblich
Gedact 16 feet tone, and Lieblich Gedact 4 feet tone; I am also enabled to transfer
the stops of one manual to another manual, thus enabling each and every stop on the
"
or the Choir Keys, or a Choir Organ could
"Swell," to be played on the Great
be taken from the "Swell," and the advantages of a three manual Organ may be thus
obtained at a slight increase of cost beyond a two-manual Organ.
Having thus particularly described and ascertained the nature of my said inveu-
tion, and the manner in which the same is to be performed I declare that what
I claim is-
In Organs constructed on the tubular pneumatic principle; the improvements in
the construction of the Pipe-Chest, Medium Chests, Pneumatic Couplers, and
Reducing hars, as hereinbefore described, and shown in the drawing.
Dated the 10th day of y
10001
ROBT. F. DRURY,
George Street, Sheffield, Agent for the Applicant.
ROBT. F. DRURY,
George Street, Sheffield, Agent for the Applicant.