Music Trade Review

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Baldwin Piano Co. Introduces Organ
Operated on Photo-Electric Principle
Now being shown at the. Convention
of the National Association of Music
Merchants for the first time since its an-
nouncement on May 24th is the com-
pletely new and exclusive "photo-elec-
of this astounding new organ is that it
incorporates for the first time in one
instrument the four primary features of
appeal in the organ field—tonal fidelity,
simplicity of playing, modest invest-
THE NEW BALDWIN PHOTO ELECTRONIC ORGAN—EXTERIOR AND INTERIOR VIEWS
trie" organ manufactured by the Bald-
win Piano Co. in Cincinnati, Ohio.
In making the announcement regard-
ing the new organ, the Baldwin Co. has
stated: "The basic musical importance
ment, and minimum maintenance ex-
pense—thus opening a vast new horns
and church market for those who have
heretofore been unable to realize the
full inspiration of fine organ music.
"The photoelectric principle is one
which has been used for a long time in
the film industry to make talking mov-
ing pictures. Among other uses, it opens
doors automatically, controls automatic
machinery, it counts high production
items such as cakes of soap, etc. It per-
forms these functions by converting
variations in a beam of light into varia-
tions in an electric current. The light
falls on a curved semi-cylinder structure
called a cathode, and causes electrons
to be emitted from it. These are picked
up by a center wire called an "anod"
and form an electric current which may
be amplified or otherwise utilized as the
purpose may require. In sound movies,
this device is used to convert a photo-
graphic image of the sound appearing
near the edge of the film (the sound
track ) into audible sound.
"In the new Baldwin organ, a light
source is directed from the bottom of
the tone generator to a photocell at the
top of the tone generator. Between the
light source and the photocell are two
transparent discs—one rotating and one
stationery—and a shutter mechanism.
The rotating disc produces pitch (or fre-
quency) . It has photographically repro-
duced on its surface a series of slots in
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THE MUSIC TRADE REVIEW, JULY, 1951
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