STROBOCONN
"PIANO TUNING" MANUAL
Figure
7-Close-up
of
Tuning Scale,
with
pointer
set
at
zero,
or
A-440.
Small
numbers
indicate
where
pointer
would
be
set,
at
single
vibration
intervals, to
tune
to
an
"A"
of
any
desired
frequency
ISee Table
II.
Cents
Frequency
From
A
From
Bb
Cycles/Sec.
+50
479.82
45
478.44
40
477.06
35
475.68
30
474.31
25 472.94
20 471.58
15
470.22
10
468.86
Bb
5 467.51
+100
0
466.16
- 5
464.82
-10
463.48
-15
462.14
-20
460.81
-25
459.48
-30
458.16
-35
456.83
-40
455.52
-45
454.20
+ 50
-50
452.89
45
451.59
40
450.28
35
448.99
30
447.69
25
446.40
20
445.11
15
443.83
10
442.55
5
441.27
A
0
-100
440.00
- 5
438.73
-10
437.47
-15
436.20
-20
434.95
-25
433.69
-30
432.44
-35
431.19
-40
429.95
-45
428.71
-50
427.47
Table 1
Cycles
i
/Sec.
I
Cents
445
+20
444
+16
443
+12
442
+ 8
441
+ 4
A 440
0
439
- 4
438
- 8
437
-12
436
-16
435
--20
Table
I-A
Tables I
and
l-A-Show-
ing Scale Pointer
settings
for
deviations
from
standard
sb
and
A.
PAGE
EIGHT
reading in a neighboring window.
For
example,
a
high
pitch A
of
457 cycles
per
second, which
is 66 hundredths
of
a semitone sharp, is read
in
the
A#
window, the reading being 34 hundredths
of
a semitone flat from A#.
To
aid players who play musical instruments
built
in
keys
other
than
C
and
who have
not
learned to transpose mentally, a transposition
indicator is provided, (See Fig.
2),
operated by
a knob
at
the
top
of
the Scanning Unit. An
opening
at
the left
hand
end
of
the mask under
"Instrument
In
Key
Of"
shows key
of
the
instrument,
and
the labels opposite each
of
the
twelve windows always correspond with the
written notes
for
that
instrument. For example,
if
an
Eb instrument is to be used, the pulling
of
the
knob
will change the label
at
the Eb
window to C, this being the written note that
must be played
in
order
to
produce a stationary
pattern
in the Eb window.
At
the same time
the labels at each
of
the
other
windows will
similarly be changed to correspond with the
written notes for
an
Eb instrument. Provision
is made
for
transposition into all the commonly
used keys:
C,
Db, Eb, F and Bb.
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