Music Trade Review -- © mbsi.org, arcade-museum.com -- digitized with support from namm.org
29
The Music Trade Review
JANUARY 1, 1927
The Technical and Supply Department—(Continued from page 28)
slight backward rake, that is to say, leaning
slightly away from the agraffe line and towards
the front or keyboard end of the instrument.
The boring of the plate must be done accord-
ingly and should be so indicated.
Drawing in Pin Holes
Having settled all these matters, we may now
undertake to draw in our tuning-pin holes. I
find that in the treble sections it seems best to
space the pins so that the distance in a straight
line from the center of the hole for string num-
ber one to that of the hole for string number
three in each unison shall be 2 l /i". This allows
for a distance of \}i" between adjacent centers,
there being three pin holes for each unison.. Be-
ginning with unison number 88, one may place
the tuning-pin hole for its middle string at a
distance of say 4" from the center of the capo
d'astro bar, and immediately to the left of the
line of the string. Then the hole for the wire
which runs at the right (towards the treble
end) of the other may be placed \ l A" nearer
to the front edge of the plate (keyboard end)
and with its center point 1/16" to the right of a
line drawn through the center of the first-placed
hole. The third hole for that unison may then
be placed at the same distance in the opposite
direction from, and to the left of, the middle
hole. When I speak here of right and left I am
looking at the piano from a position in front
of the keyboard, as if playing.
It will be found that this distance from center
pin of any unison to center pin of the next
will, on this system, be %", which will exactly
fit in with the space of Y" between middle
strings of adjacent unisons at the hammer line.
The only exceptions to the rules here given
are of course, to be found if and when the longer
strings are slanted sufficiently to bring about
some crowding together of the pins. In the
spacing and slanting already laid out, however,
we have assured against any crowding among
the strings at the lower end of the understrung
sections.
The spacing of pin holes in the bass is, of
course, somewhat simpler, owing to the sub-
stitution of bi-chords for tri-chords. The same
principles of spacing, however, must be ob-
served, merely noting that there is more room
with bi-chords and that it is well in this case
to spread the pins as evenly as possible over the
wrest plank.
As a matter of practice it is always well to
lay out the drafting of these holes carefully be-
fore beginning to draw them in. One can
draw lines across the paper to indicate the
transverse positions of the three lines of pins
belonging to the tri-chord uniso- 3, thus fixing
the proper distances in that co-r linate. In the
other co-ordinate one may alsr draw lines at
right angles showing the 1/16' ,>actng above
mentioned. Then, with a sf : ::;_ bow compass
properly set, the circles car. ';, quickly and cor-
rectly described.
Bars
We may now begin to c : !?r the last of
our tasks, which are to A . :: '.he bars and
calculate their dime- ' :is I-MV' r with the
FAU5T SCHO9L
0. TUNING
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GREETINGS
A Happy New Year to one and all, for the
twenty-fourth consecutive time.
Correspondence
is solicited and should be addressed to William
Braid White, 5149 Agatite avenue, Chicago.
Distance Records Set
at Danquard Course
Tuners Come All the Way From Peru, South
America, to Attend New York Classes
The great interest taken by tuners and repair-
men in opportunities for gaining wider informa-
tion regarding the repair and maintenance of
player and reproducing actions was strongly
emphasized. At the recent sessions of the Dan-
quard Player Action School held in New York,
which was attended by a number of men who
came from considerable distances to receive
the instruction.
The distance record for the school was held
by Benjamin R. Domongues, of Peru, South
America, who attended all sessions at the
school. Next in line came G, J. Belair, of
Minneapolis, Minn., who, having missed the
classes held in Springfield and Peoria, 111., came
all the way to New York to attend the course.
Fred C Throm came from Rome, N. Y., and
several others who attended lived at points
well beyond the borders of the metropolitan
area.
This realization of the importance of a
thorough knowledge of the player and repro-
ducing mechanisms and means for adjusting
and repairing them is regarded as one of the
most prominent developments in the trade for
it means the proper servicing of instrument
Tuners Carrying Case
LIGHT—COMPACT—SERVICEABLE
Weighs Only 6 Pounds
Outside measurements 15j^ inches long, 7
inches wide, 8 inches high.
No. ISO—Covered with seal grain imitation
leather. Each $13.00
No. 200—Covered with genuine black cow-
hide leather. Each $20.00 F.O.B. New York.
When closed the aluminum
trays nest together over the large
compartment, which measures
137/ 8 " x 6" x 4". The two left hand
trays measure 13?/g" x 2%" x \y%
and the two right hand trays 13^s"
x3y^"xiy 8 ".
The partitions in
right hand trays are adjustable or
may be removed. Case is fitted
with a very secure lock and solid
brass, highly nickel-plated hard-
ware.
We have a separate Department to take care of special requirements
of tuners and repairers. Mail orders for action parts, repair materials,
also tuning and regulating tools are given special attention.
Ha: imacher, Schlemmer & Co.
Pi ::o and Player Hardware, Felts and Tools
New York Since 1848
OTTO R. TREFZ, JK
Av-.
is a great help in avoiding an ugly width in
the case and through the plate.
\1 \«iS
Tuners and Repairers
2 1 1 0 f airmounl
thickness of the iron at various points and the
levels of the various parts of the plate in re-
lation to bridges, sound board, etc.
The first thing to be considered is how much
stress is to be borne by the bars. If we take
the first section in the treble, from unison No.
88 to unison No. 59, or thirty unisons in all,
we may calculate the stress when the strings
are tuned as 3 x 30 x 160 pounds, which is
equal to 14,400 pounds. Now if we consider
the bar which bounds the extreme treble edge
of the plate, and which is very short, owing
to the shortness of the distance at that place
between tuning pin and high pin positions,
and if we then turn to the bar which is to run
across at unison No. 59, we shall see that these
two between them must carry 14,400 pounds
of compression. But the longer of the two
bars must also carry half of the stress of the
next lower section, which also contains thirty
unisons and of which the stress may be con-
sidered as approximately the same. Suppose
we say that the total stress of compression on
the three bars which support the understrung
sections from unison No. 88 to unison No. 29,
inclusive, is 30,000 pounds. One of these bars
is at unison 88, one between unisons No. 59
and 58 and one between unisons No. 28 and
27, the latter being the first of the overstrung
unisons. Dividing the stress among the three,
as we safely may because they have been
spaced accordingly, we find that each has to
carry 10,000 pounds. Now the ordinary al-
lowed load on gray iron columns in building
construction is 10,000 pounds compression per
square inch of cross-sectional area. That would
mean that we should only need an area of one
square inch. But we can allow a little more
than this, say 1% square inches, and that can
be obtained by almost any arrangement of
dimensions, allowing, however, for the fact that
the strength of a beam is as the square of its
depth, but only directly as its thickness. So
we make our bars as deep as we can, and then
we may make them conveniently narrow, whicli
Ph.I*. P
4th Ave. at 13th St.