Music Trade Review
Issue: 1930 Vol. 89 N. 10 - Page 31
Music Trade Review -- © mbsi.org, arcade-museum.com -- digitized with support from namm.org
The Music Trade Review
OCTOBER, 1930
respect very well with the results obtained by
Mahajan, and by him described with illustra-
tions in a most interesting paper on the vibra-
tions of the pianoforte soundboard, published
in the Indian Journal of Physics, volume 4, part
6, published at Calcutta by the Indian Associa-
tion for the Cultivation of Science. Mahajan's
results, were obtained mechanically, by photo-
graphing the movements of an illuminated mir-
ror attached to a light steel pin, which was
caused to move by the vibratory motion of the
rib of a pianoforte soundboard, against which
the pin was arranged to roll. This mechanism
might have been expected to display the effects
of mechanical friction to a greater extent than
ours, but the agreement, so far as our work has
gone, is quite remarkable. On the other hand,
improved pick-up on our part may give us
more complex wave-forms from the sound-
board, more closely corresponding with the
wave forms given out from the complete sound
as microphonically received. The question
meanwhile arises: if our pick-up is doing its
duty effectively, how is it that the sounds of
the piano as heard are so much more complex
than the motions of the soundboard?
2. There is a remarkable falling off in reso-
nating power from the central region of the
board toward the rim, in all directions. The
region of effective resonance for the whole
3. The maximum resonance point for each
note is individually and separately placed,
although most of them are grouped together
within the small space mentioned above.
4. The effectiveness of the board as resona-
tor appears to be nearly proportionate inversely
to the stiffness. The small area of maximum
resonance is very close to the physical center
of the board, where the stiffness is smallest.
These are all the statements which I feel
justified at the moment in making but I will
have more positive data within a month or two.
Philip W.0etting& Son
are far more than
merely good plates.
They are built cor-
rectly of the best
material and finish,
and are specified by builders of quality
pianos.
INC.
213 East 19th Street
NEW YORK
Sole Agent* for
PIANO ACTION
MACHINERY
Designers and Builders of
Special Machines
for
Special Purposes
THE A. H. NILSON
MACHINE CO.
CONN.
Badger Brand Plates
American Piano Plate Co.
WEICKERT
Hammer and Damper
Felts
Continuous Hinges
Grand Hinges
Pedals and Rods
Bearing Bars
Casters, etc., etc.
Service
Price
nc
For Quality
Reliability
BRIDGEPORT
scale appears to lie diagonally and roughly in
the shape of a very flat ellipse starting some-
where in the region of the C 52 strings and fol-
lowing roughly the direction of the treble bridge,
towards the bass bridge. The region is from
15 to 20 inches wide, and occupies a large part
of the space between the front or head-block
edge of the board and the treble bridge. Out-
side of this region towards the rim, the drop
in resonating power is sudden and precipitous.
Inside the region, the area of maximum reso-
nance for all notes is very small, being only a
few inches square, and from it towards the
boundaries there is an abrupt descent in effec-
tiveness beginning within six inches of the cen-
tral point as determined for each note.
Manufacture™ BADGER BRAND Grand and
Upright Piano Plata*
Racine, Wisconsin
CHAS. RAMSEY CORP.
KINGSTON, N. Y.
THE SELPO PIANO TRUCKS
The End Truck is very convenient where there is not
much stair work and can be easily carried in a small
amount of space. A board is used when piano is on the
stairs. The frame of the SelPo trucks are made of
crucible spring steel, cross braced and riveted. The hard
maple boards are padded with heavy felt.
SelPo C—Plain bearing rollers iron wheel casters, shipping:
weight 95 lbs., $44.00.
SelPo B—Plain bearing roller rubber tired casters, $47.00.
SelPo E—Roller bearing rollers iron wheel casters, $49.00.
SelFo D—Roller bearing rollers rubber tired casters, $52.00.
Ask for a catalogue of our complete line of TRUCKS,
HOISTS, light weight trucks, SKIDS, DOLLYS, Concert
Grand Trucks and Special Straps.
Manufactured by
SELF LIFTING PIANO TRUCK COMPANY
4X5 N. Main St.
Findlay, Ohio
JULIUS BRECKWOLDT & SON, Inc.,
Y.
Manufacturers of Sounding Boards, Bars, Backs, Bridges, Mandolin and Guitar Tops, Etc.
O. S. KELLY CO. - PIANO PLATES
The Highest Grade of Workmanship
Foundries: SPRINGFIELD, OHIO
THE COMSTOCK, CHENEY 6t CO
IVORYTON, CONN.
Ivory Cutters since 1834
MANUFACTURERS OF GRAND KEYS, ACTIONS, AND HAMMERS, UPRIGHT KEYS,
ACTIONS AND HAMMERS, PIPE ORGAN KEYS, PIANOFORTE IVORY FOR THE TRADE
The Music Trade Review
OCTOBER, 1930
respect very well with the results obtained by
Mahajan, and by him described with illustra-
tions in a most interesting paper on the vibra-
tions of the pianoforte soundboard, published
in the Indian Journal of Physics, volume 4, part
6, published at Calcutta by the Indian Associa-
tion for the Cultivation of Science. Mahajan's
results, were obtained mechanically, by photo-
graphing the movements of an illuminated mir-
ror attached to a light steel pin, which was
caused to move by the vibratory motion of the
rib of a pianoforte soundboard, against which
the pin was arranged to roll. This mechanism
might have been expected to display the effects
of mechanical friction to a greater extent than
ours, but the agreement, so far as our work has
gone, is quite remarkable. On the other hand,
improved pick-up on our part may give us
more complex wave-forms from the sound-
board, more closely corresponding with the
wave forms given out from the complete sound
as microphonically received. The question
meanwhile arises: if our pick-up is doing its
duty effectively, how is it that the sounds of
the piano as heard are so much more complex
than the motions of the soundboard?
2. There is a remarkable falling off in reso-
nating power from the central region of the
board toward the rim, in all directions. The
region of effective resonance for the whole
3. The maximum resonance point for each
note is individually and separately placed,
although most of them are grouped together
within the small space mentioned above.
4. The effectiveness of the board as resona-
tor appears to be nearly proportionate inversely
to the stiffness. The small area of maximum
resonance is very close to the physical center
of the board, where the stiffness is smallest.
These are all the statements which I feel
justified at the moment in making but I will
have more positive data within a month or two.
Philip W.0etting& Son
are far more than
merely good plates.
They are built cor-
rectly of the best
material and finish,
and are specified by builders of quality
pianos.
INC.
213 East 19th Street
NEW YORK
Sole Agent* for
PIANO ACTION
MACHINERY
Designers and Builders of
Special Machines
for
Special Purposes
THE A. H. NILSON
MACHINE CO.
CONN.
Badger Brand Plates
American Piano Plate Co.
WEICKERT
Hammer and Damper
Felts
Continuous Hinges
Grand Hinges
Pedals and Rods
Bearing Bars
Casters, etc., etc.
Service
Price
nc
For Quality
Reliability
BRIDGEPORT
scale appears to lie diagonally and roughly in
the shape of a very flat ellipse starting some-
where in the region of the C 52 strings and fol-
lowing roughly the direction of the treble bridge,
towards the bass bridge. The region is from
15 to 20 inches wide, and occupies a large part
of the space between the front or head-block
edge of the board and the treble bridge. Out-
side of this region towards the rim, the drop
in resonating power is sudden and precipitous.
Inside the region, the area of maximum reso-
nance for all notes is very small, being only a
few inches square, and from it towards the
boundaries there is an abrupt descent in effec-
tiveness beginning within six inches of the cen-
tral point as determined for each note.
Manufacture™ BADGER BRAND Grand and
Upright Piano Plata*
Racine, Wisconsin
CHAS. RAMSEY CORP.
KINGSTON, N. Y.
THE SELPO PIANO TRUCKS
The End Truck is very convenient where there is not
much stair work and can be easily carried in a small
amount of space. A board is used when piano is on the
stairs. The frame of the SelPo trucks are made of
crucible spring steel, cross braced and riveted. The hard
maple boards are padded with heavy felt.
SelPo C—Plain bearing rollers iron wheel casters, shipping:
weight 95 lbs., $44.00.
SelPo B—Plain bearing roller rubber tired casters, $47.00.
SelPo E—Roller bearing rollers iron wheel casters, $49.00.
SelFo D—Roller bearing rollers rubber tired casters, $52.00.
Ask for a catalogue of our complete line of TRUCKS,
HOISTS, light weight trucks, SKIDS, DOLLYS, Concert
Grand Trucks and Special Straps.
Manufactured by
SELF LIFTING PIANO TRUCK COMPANY
4X5 N. Main St.
Findlay, Ohio
JULIUS BRECKWOLDT & SON, Inc.,
Y.
Manufacturers of Sounding Boards, Bars, Backs, Bridges, Mandolin and Guitar Tops, Etc.
O. S. KELLY CO. - PIANO PLATES
The Highest Grade of Workmanship
Foundries: SPRINGFIELD, OHIO
THE COMSTOCK, CHENEY 6t CO
IVORYTON, CONN.
Ivory Cutters since 1834
MANUFACTURERS OF GRAND KEYS, ACTIONS, AND HAMMERS, UPRIGHT KEYS,
ACTIONS AND HAMMERS, PIPE ORGAN KEYS, PIANOFORTE IVORY FOR THE TRADE
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