Year: 1888

page_text: Date of Application, 16th May, 1888
Specification Accepted, 14th Sept., 1888
I, JOHAN PETTER NYSTRÖM, instrument-maker, Karlstad in the Empire of Germany
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:-
1-
My invention relates to organs having suction-bellows and comprises improved
means for altering the force or strength of the sound.
In organs at present in use there is generally an arrangement, by means of which
" forte
the strength of tone can be raised above the normal, or
can be obtained.
This arrangement, which also is used in the present invention, consists of a forte lid
This lid can be
placed in front of the stops along the manual in its whole length.
turned on its upper edge and has the lower edge clad with a tolerably loose cloth
packing. When this lid is lowered to the bottom of the tone chest, the air can only
penetrate through the above mentioned cloth-packing, whereby the soft and full
"normal tone" is obtained. When again the lid is raised, the air streams unimpeded
into the stops, by which the tone increases in force, even if it also loses something in
harmony. This relation must be specially noticed, because it more nearly determines
what is meant by "normal tone," which is besides nearly the same for all organs of
the same size.
The objects of the present invention are, to obtain a tone of less force than the
normal, that is to say, to obtain "piano," as also, through a united action between the
forte-lid and the lids described below, to obtain several distinct combinations of tones
of various strengths in treble and bass, sounding simultaneously, and to provide
improved arrangements for the manipulation of these lids.
In the accompanying drawings,
Figure 1 shows in transverse section, the upper parts of an organ, and
Figure 2 a front view of the same, the forte-lid being supposed to be removed, so
that the lids situated within it and hereinafter described become visible; also the stop-
holes, which for the greater part are concealed by these lids, are shown by dotted
lines

page_text: The new lids are A, B, C, D, and lie all in the same line in the manner shown by
the section, figure 1, in which the lid C is intersected. They are thus placed within
the forte-lid E, figure 1, and they close tight against the forks of the organ, and are
there furnished with a soft leather packing. At their inner ends they are separated
by thin partitions F, G, H. The lids are fixed immediately above the stophole and
can be let down towards the tone chest close to the tone plate. On the lower side
they are as at the ends clad with leather packing. When now, for example, the lid C
is let down, in the manner shown by dotted lines in figure 1, there arises between this
and the stop-hole a very small space of triangular form, which unites all the stop-holes
situated behind the lid, and when any of the other lids is let down, the stopholes of
another group are united in the same way by a narrow passage...
The lids A, B, C, D, stand open, when tone of normal strength is to be obtained.
In case a diminuendo" is desired in any part of the bass or the treble, the
corresponding lid is lowered gradually until closed, when the force of the tone
decreases to the very faintest pianissimo, resembling a distant eclio.
The cause of this effect, in comparison with the effect of the forte-lid, which may be
supposed to work in nearly the same manner, is twofold. In the first place the
packing of the lids A, B, C, D,. is much tighter than the packing of the lid E.
Further, the lids A, B, C, D, are placed close to the stop-holes, so that, as above
mentioned, only a very narrow passage is allowed for the air streaming in through the
packing, to reach that or those stops which are open. The final strength of tone thus
depends completely on the size of this triangular formed space; in case this space is
removed altogether, the sound is completely deadened and the lids become trans-
formed into usual sound-mufflers; which take away the sound altogether.
Instead of the four lids now described, two can also be used by removing the
partitions F and H, so that the lids A and B become one-A B-and likewise C and D
become one lid-CD. There will thus be formed a lid A B to produce piano in
the bass and a lid CD for the same object in the treble. With, both these lids, which
can be manipulated separately, the following combinations of strength of tone in bass
and treble can in union with the forte-lid E consequently be obtained
1
'J'
normal
normal
normal
forte
forte
piano
normal'
***forte
piano
forte'
piano
piano
1. all the combinations properly shaded by moving the lids more or less.
By, the, more complete modification of the invention shown in Figure 2, four
separate lids A, B, C, Das formerly described are made use of. All the lids are held
...open by springs.. On the lid A there is first a pin I which projects above the edge
of B. When A is lowered, B must thus always follow, but not conversely. In--the
same way the lids C and D are connected by a pin so that when D. is 'let down, C must
..follow but not conversely.. Again, on B and C a common lever operates so that they
can be simultaneously lowered.
The object of this arrangement is easily perceived. By means of it, "piano" can
be extended to the middle register.
Piano
can thus be obtained in the following
Panos

page_text: thus been considerably increased. As, however, the manipulation in the latter case is
much more difficult, the simpler arrangement can in many cases be made use of.
The contrivance for the convenient manipulation of the lids constitutes a very
important part of the invention. For the first modification of the lids three so called
knee registers Q R T are made use of. In the way shown by the drawing the
lids A, B and C, D are lowered by means of the levers L and P when the knee
registers and T will be pressed outwards. Thus "piano" in bass or treble, or both,
will he obtained. In front of the forte-lid E there is a knee register R furnished with
two levers M and N which raise the lid E from whichever direction the pressing takes
place. "Forte
can thus be obtained as well with the right as with the left knee,
that is to say with that knee which is not for the moment used in producing "piano
in bass or treble.
"
For the other modification of the lids there is, in addition to the knee registers just
now described, a fourth and similar one $ fixed close to T, but somewhat within the
line of the former ones. Its lever O catches both the lids Band C as before mentioned.
When "piano" is to be extended to the middle register from bass or treble, the right
knee will thus be pushed in, so that it may press upon the knee register S.
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 :-
1. Two lids, A B and C D separated by a partition G and at the outer ends
provided with leather packing against the forks of the organ, one of them in front
of the bass, the other in front of the treble, fixed immediately above the mouths
of the stopholes and capable of being lowered to the bottom of the tonechest close to
the toneplate in such a manner that between the stophole and the above mentioned
lids a narrow, triangular undivided air space is formed for the bass and a similar
one for the treble to which air chambers the air only can gain access through a
leather-packing on the lower edge of the lids.
2. The combination of the lids A B and C D named in claim 1. for diminishing the
sound, with a usual so called forte-lid E placed outside of these, in combination with
the contrivance for the manipulation of these three lids, consisting of two usual knee
registers, QT, working in one direction, each connected with its corresponding
lid A B, C D and a third knee register R placed between these and moveable on
both sides, connected with the above named forte-lid E.
3. The modification wherein the lids A B and C D named in claim 1 are, by means
of the partitions F and H divided in two, whereby four lids A B C D are obtained
which are connected in such a way that pins IK fixed on A and D rest against B
and C respectively, so that these must follow in case A and D are lowered but not
conversely when B and C are lowered, which is effected by means of a knee register S
common to them both, placed near to the right knee-register, but farther in below
the organ.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London,
Agents for the Applicant.