Music Trade Review

Music Trade Review -- © mbsi.org, arcade-museum.com -- digitized with support from namm.org
The Music Trade Review
44
NOVEMBER 20, 1926
The Technical and Supply Department—(Continued from page 43)
motion is through it produced on both sides of are to be drawn and can then later on draw the J. A. Vogt Handles
the fulcrum. At the upper end of the scale, little circles which are to preserve the points
where strings are short, it is evident that the on the drawing. It is advisable to have the
Pfriemer in the West
hitch pins as nearly as possible in a single line,
waste ends may for some considerable number
of unisons be as long, or nearly as long, as the
vibrating lengths in each case. This being so,
the stiffness of the wire on either side of the
bridge may be quite or nearly equal. When,
however, the strings become much longer than
the waste ends can possibly be, the stiffness
factor becomes greater, which, in turn, neces-
sarily involves less and less freedom of vibra-
tion for the speaking lengths. Other things
being equal, then, it is always highly important
to provide for a waste length sufficiently long
to prevent the vibratory motion of the main
string from being too much bound up, as it
were, and on the other hand to prevent exces-
sive flexibility on strings whose length tends to
promote this defect. Thus it may be said that
while the higher and shorter strings, which
suffer if anything from too great stiffness,
should be provided with waste ends at least as
long as the speaking lengths, this condition
should be progressively modified as the vibrat-
ing lengths are increased. Nevertheless, I think
it better never to have waste ends shorter than
one-fourth of the vibrating length, save where
the conditions of space prohibit this, as at the
longest string of the treble and (in very small
grands) through the bass. Even at that, it is
not good for tone to allow the waste ends to
run less than three and one-half inches to three
inches in length. If this rule be violated the
resulting tone will almost certainly be short and
gruff. Here again is a hint to the designer of
miniature pianos, whether horizontal or vertical.
Locating Hitch Pins
There should be no difficulty in locating the
positions of the hitch pins. In the treble sec-
tions for the trichord unisons there are, of
course, three hitch pins for every two unisons,
that is to say, one hitch pin for every two wires.
It is only necessary to draw pencil lines repre-
senting the waste ends of the wires and then
locate the hitch pin points nearly between each
pair of lines, taking care that the latter run
nicely in line with the vibrating lengths. The
side bearing between the bridge and the hitch
must be carefully preserved. The wound uni-
sons, of course, take one hitch pin for each wire.
In drawing the lines representing the waste
ends it is, of course, necessary, first, to locate
the positions of the nearer bridge pins and this
is easily done by means of a small gauge, such
as bellymen use. It can easily be made from a
slip of brass with three little points at one end
of it, spaced to indicate the distance from pin
to pin in each trichord. The opposite end may
be fitted with two points for the bichords.
Using such a gauge one can quickly prick out
on the paper the points from which the lines
"MARKDOWNS"
ARE UNNECESSARY
EALERS everywhere are finding it
D easy
to repair damage to varnished
surfaces—consequently making big sav-
ings through the elimination of the
necessity for mark-downs. Our little
booklet "How to Repair Damage to
Varnished Surfaces" tells how you, too,
can do this. A copy of this will be
sent to you free upon request.
The M. L. Campbell Co.
1OOS W. 8th St.
curved, of course, according to the run of the Well-known Supply Salesman Succeeds George
bridges.
A. Ruths as Representative of That Product
Agraffes and Capo d'Astro
An announcement a short time ago to the
We may next consider setting in the positions
of the agraffes and of the capo d'astro bar. Tak- effect that Joseph A. Vogt, well known in the
ing the agraffes first, we begin by drawing a West for many years as a representative of
circle for each one from a center furnished by
the point at which its position was originally
located. The diameter of the circle should be
equal to that of the flange of the agraffe. A line
should then be drawn through each center as a
diameter to the circle and exactly at right angles
to the line which indicates the middle string
of each trichord, or the center line between the
strings of each bichord. By doing this we indi-
cate clearly how each agraffe is to be slanted
when it is screwed into the iron plate.
For the present, it is only necessary to draw
a line connecting the limiting points of the
strings in the capo d'astro section. This line
represents the line of the bearing surface on the
under side of the bar. The details of the bar,
showing its thickness, height, etc., can be drawn
in later.
(To be continued)
Correspondence
is solicited and should be addressed to William
Braid White, 5149 Agatite avenue, Chicago, 111.
Announces Short Course in
Kiln Drying of Lumber
November 13.—Announcement
has just been made by the U. S. Forest Prod-
ucts Laboratory that the regular mid-Winter
short course in the kiln drying of lumber will
be given January 10 to 21, inclusive.
MADISON, WIS.,
J. A. Vogt
supply houses, has now taken on a new line, as-
sociates him with the old-established piano
hammer manufacturer, Charles Pfriemer, Inc.,
New York. Mr. Vogt will represent the Pfriemer
house exclusively in the West with headquarters
TUNERS
AND
REPAIRERS
Our new catalogue of piano and
Player Hardware, Felts and
Tools is now ready. If you
haven't received your copy
please let us know.
Kansas City, Mo.
FAUST SCHOOL
OF TUNING
"M^ndard of A m e r i c a
A l u m n i of 2 0 0 0
Piano Toning. Pipe and Reed Organ
and Player Piano Year Book Free.
27-29 Gain»boro Str««t
BOSTON, MASS.
I
Hammacher, Schlemmer & Co.
New York. Since 1848
4th Ave. and 13th St.
~ A
1
J
•a!
-I
i
* i