Music Trade Review

Issue: 1927 Vol. 84 N. 21

Music Trade Review -- © mbsi.org, arcade-museum.com -- digitized with support from namm.org
TECHNICAL^SUPPIY DEPARTMENT
William
BraidWhiteXecfimcalEditor
Which Has the Greater Influence on
Tone—The Sound Board or the Strings ?
Some Reflections on One of the Great Controversial Questions in the Technology of
the Piano Construction—Possible Ways to Its Solution
I
N the technology of the pianoforte there
are certain questions which constantly re-
appear, no matter how often they may be
treated in the attempt to settle and dispose of
them. If one looks closely at the history of
pianoforte construction during the last century
one is almost compelled, willy-nilly, to con-
clude that most of these have been in their
very nature insoluble, at least in the absence
of those precise methods of inquiry which only
now are coming into a rather uncertain and
belated favor. Among them all no one has
been so thoroughly the subject of controversial
discussion as the question whether the sound
board or the strings have the greater influence
in tonal production. And since at the present
time there is every reason to feel that those
whose business it is to design and construct
pianofortes are more willing to undertake fun-
damental questionings than previously they
have ever been, some more words at this time
apropos this famous controversy may not be
entirely inappropriate.
In any technological field which has not had
the advantage of scientific foundations it is
almost certain that opinions on important ques-
tions will partake far too much of personal,
and far too little of detached and impersonal,
Our large stock is r*rj seldom
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coloration. It is quite usual to hear piano
makers of various degrees (and piano tuners,
too) talking in a vein of complete assurance
about matters which scientific men who have
attempted to analyze them would certainly treat
with much reserve. Piano makers who are thus
dogmatic have simply never understood the
data upon which they are so ready to pro-
nounce; have never, in point of fact, had those
data before them in anything like their com-
pleteness. If the data had been before those
confident gentlemen in all their completeness,
if in fact they had ever been able to know (in
the strict sense of the words) what they were
talking about, it is quite certain that they would
usually have been far less confident in the
expression of their opinions. Scientific knowledge
always makes one very humble and very chary
of expressing dogmatic opinions about anything.
It is precisely with these thoughts in mind
that I venture to discuss here, quite tentatively
and without any notion of definite pronounce-
ments, the vexed question of the relations
between sound board and strings. What is
written here takes shape largely as the result
of having been able to talk over with Vice-
President Taylor and Research Director Wood-
bury, of the Mason & Hamlin Co., some of
their recent work in tonal research and of
having at first hand examined their data and
their methods of handling them. But, of course,
the opinions expressed are my own, I am alone
responsible for them, and they will be found
not to disagree in principle, I think, with the
opinions I have been known to hold during
many years.
Sound Board Motions Established
As I have had occasion to say quite definitely
in some very recent articles, there is not the
slightest question as to the existence of definite
and perceptible surface motions in the sound
board, motions which correspond with the
original periodic motions imparted to the
strings by the blows of the hammers. If a
pianoforte be carefully damped so that the
sound board cannot impart its surface motions
to the air (as by covering both its surfaces
with,a' heavy, continuous sheet of thick damper
felt), we at once perceive that the sounds which
are now given out are both "metallic" (twangy)
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THE M. L. CAMPBELL COMPANY
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Punchings
Washers
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Direct Manufacturer* of
TUNERS' TRADE SOLICITED
Kansas City, Mo.
{Continued on page 30)
William Braid White
Associate, American Society of Mechanical
Engineers; Chairman, Wood Industries
Division, A. S. M. E.; Member, American
Physical Society; Member, National Piano
Technicians' Association.
Consulting Engineer to
the Piano Industry
Tonally and Mechanically Correct Scales
Temal and Technical Surreys of Product
Tonal Betterment Work in Factories
Reference*
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29
and leeble. What is more, they die away more
rapidly, or at least are heard by the ear for a
shorter length of time. If now we examine the
sounds thus produced by any visual means, we
find that they are exactly what we should have
expected from the knowledge we have of the
behavior of stretched pianoforte strings which
are struck by pianoforte hammers. In a word,
they present the expected combination of fun-
damental and partial vibration forms, expressed
in resultant curves of familiar shapes. On the
other hand, when we take away the damping
material and restore the sounds to their original
quantity and quality, we find two interesting
facts, which, however, are also what should
have been expected. We find that the amplitude
of the sound curves is throughout greater for
equivalent hammer velocities (i.e., equivalent
blows upon the keys), and at the same time
that, in general, the even numbered partials
(octaves, octave twelfths, etc.) are strengthened
at the expense of the others (twelfths, seven-
teenths, etc.). It is evident that the effect of
the sound board is twofold and that it both
amplifies and modifies.
Qualitative vs. Quantitative
I might as well say frankly that I am not
at this moment in possession of quantitative
measurements on this point, although these will
come in due course. I cannot at this moment
say exactly how far this property exerted by
the sound board may be said to extend for
each note of the scale. It is, in fact, extreme!}
probable that we shall find quantitative meas-
urement a process of considerable confusion,
which will require a very great deal of inter-
pretation, and that an element of uncertainty
will be injected into any opinions founded upon
it. On the other hand, qualitative interpretation
is much simpler. It is only necessary to ex-
amine visually the sound curve to see that what
I have already described does exist. On the
other hand, if each curve be photographed, it
may be placed, in turn, under the Henrici
harmonic analyzer, whereupon each of its com-
ponents may be discovered and its relative
amplitude set forth.
The Plausible Fallacy
The sound board, then, is amplifier and modi-
fier. Hut that is not at all the same as to
say that it is itself a prime vibrator. A great
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Music Trade Review -- © mbsi.org, arcade-museum.com -- digitized with support from namm.org
30
The Music Trade Review
MAY 21, 1927
The Technical and Supply Department (Continued from page 29)
many piano makers will say that the sound
board is all the piano, speaking tonally, and
that if the board be well and truly made the
scientific accuracy of the scale does not matter.
The argument seems to run somewhat as fol-
lows : Pianos are known, of which the tone
is beautiful, but of which the scale design is
old-fashioned, in the sense at least that it has
never been changed to any important extent
for many years. These pianos are known to
be made in factories where an immense amount
of attention has always been given to bellying
methods, of which the virtue is attested by the
innumerable and futile imitations of them which
have been attempted by others. Ergo, the
sound board work is the only, or at least bj
far the more important, element in the produc
tion of beautiful tone.
The reason is plausible but fallacious, for
it begs the question at issue. The answer to
the fallacy is to be found simply in producing
a scientifically correct scale for a piano which
has always been noted for its beautiful bellying
work. The combination, as is known, is simply
invincible.
The sound board, in fact, is a musical instru-
ment, in the sense that it responds to the
impression of musical vibratory motions upon
it. But just as a Stradivarius violin in the
hands of a child produces sounds very different
from the tones evoked by a Kreisler, so also
a fine piece of sound board work can by no
means be expected to give forth the possibilities
it includes within itself unless the string plan
above it is scientifically worked out. For the
sound board can only work upon the tonal
material which it receives. If this tonal raw
material—which is another name for the
scheme of string lengths, loadings, striking
points and so on, known as the scale—be con-
ceived in view of some understood and foreseen
tonal ideal, then it is certain that a sound board
*can be designed and built which shall make the
most of that ideal; or again, it may be said
that the finest sort of painstaking and experi-
ence founded sound board work can only find
itself escaping a certain amount of futility if
and when it has been worked out as the ex-
pression-means of a scientific scale. And there,
I think, is the whole secret and the answer
to the whole question.
Interaction of Elements
The production of tone, in fact, is not the
work of any element in a musical instrument
so complicated and highly organized as is the
pianoforte. It is the resultant of a large num-
ber of interacting forces, which are originated
from one point or from a group of points, and
which require for their adequate expression the
complete and what may be called "harmonious"
interaction of all the affected elements. Scale,
sound board, hammers, action, all alike are in-
dispensable, all alike are interdependent. Rut
there must be a place of origination. That
place is found among the strings; or rather
we should say that those places are there
found, for it is seldom that we can refer the
origin of any tonal excitation to one single
focus of excitement. The strings are the
originators, the sound board is the amplifier
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and the modifier. Nothing can be done by the
sound board save as the strings first convey
to it a message. The nature of that message
may be thus or so; but the sound board has
the power only, as it were, of editing and
amending it. The sound board cannot funda-
mentally alter its meaning. It cannot, to carry
on the analogy, insert a "not" in an affirmative
statement. It can edit, but it cannot contra-
dict.
tions are now being freely discussed in fac-
tories and among rival factory technicians
constitutes one of the happiest manifestations
of a welcome and auspicious change of mind
for the better.
Correspondence
is solicited and should be addressed to William
Braid White, 5149 Agatite avenue, Chicago.
To Sum Up
So that, if all this has any significance at
all, its meaning must be found in the under-
standing that the elements of pianoforte design
and construction cannot be isolated the one
from the other. It is simply ridiculous and
utterly futile to pursue the will-o-the-wisp of
single-minded devotion to one element. To
design a good scale and neglect the delicate
task of adjusting to that scale a correct sound
board, correctly placed and constructed ham-
mers and a correctly adjusted action, is to
achieve at best a stalemate. To concentrate
on beautiful sound board work and to attempt
to find the tonal solution therein, to the neglect
of scientific work on string lengths, loadings,
physical properties of wire, striking distances
and hammer construction, is to spend one's
lime forever battling against windmills, forever
chasing an ignis fatuus, forever glimpsing the
errant and the perpetually elusive spirit of the
beautiful. That tricksy sprite can only be run
to earth by those who know how to combine
their forces.
Our question then is answered in neutral
language. It is impossible to separate sound
board from strings, and although a bad sound
board with a scentinc scale will never produce
good tone, a good sound board with a bad
scale will never achieve what otherwise would
be well within its reach.
The new spirit which is beginning to animate
(happily) the world of pianoforte manufactur-
ing is certain to bring to the front man\ other
questions like this; and the fact that such ques-
Wider Research Needed
in Properties of Wood
Forest Products Laboratories Lists Thirty
Separate Properties of Product That Require
Investigation
MADISON, WIS., May 16.—The Forest Products
Laboratory has listed thirty separate and dis-
tinct properties of wood as needing study.
According to investigations of the Laboratory's
experts each of the principal commercial species
of wood has in some degree all of the thirty
properties listed. Some of these properties
have already been studied, while others so far
have had but little if any attention. Among
the properties upon which considerable in-
formation and data have already been gathered
are listed the following:
"Weight, strength in bending and compres-
sion, hardness, toughness, shock-resisting abil-
ity, stiffness, resistance to splitting, tendency to
develop defects in drying, susceptibility to
standard preservative treatment, gluing charac-
teristics."
This includes ten, or just a third of the thirty
properties listed. On some of the others a little
information has been- gathered, but on the rest
practically nothing. The other properties listed
are as follows:
"Resistance to abrasion, nail and screw-hold-
ing power, workability under machine and hand
(Continued on page 31)
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,. , , it .
Hammacher, Schlemmer & Co.
Piano and Player Hardware, Felts and Tools
New York Since 1848
4th Ave. at 13th St.

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