Radio today (Sept 1935-Dec 1936)
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(c) Microphone hummer (electromagnetic feed-back)
(d) Vibrators with any type of pickup and any type of feed-back
(e) Any type of vibrator with any type of excitation and with any type of pickup with electrical output such as :
Vibratory generators
Excitation Methods
(1) Striking
(2) Plucking
(3) Bowing
(4) Blowing
(5) Resonance
(6) Attraction
(7) Repulsion
Vibrator
(1) Strings
(2) Reeds
(3) Rods:
(a) Transverse
(b) Longitudinal
(c) Torsional
(4) Forks
(5) Bells
(6) Tubes
(7) Clock chimes
(8) Membranes
(9) Sounding boards
Pickup Methods
(1) Magnetic
(2) Electrostatic
(3) Electrodynamic
(4) Interrupted Contact
(5) Modulated Resistance:
(a) By Pressure
(b) By Temperature
(c) By Area
(d) By Length
(e) By materials in ion streams
(6) Piezo-electric (vibrator and translator may be combined as one device)
(7) Photo-electric
(8) Magneto-strictive
(9) Microphonic (air waves or mechanical)
(10) Thermo-electric
(11) Magneto-electronic
(12) Magneto-resistive
Acoustic vibrators
(a) Pipes or horns
(b) Reed pipes
(c) Sounding boards variously driven
(d) Membranes
(e) Bells, bars, strings, tubes, reeds, forks, chimes, and other sounding bodies
Timbre-control methods
(1) Synthesis : adding together pure or relatively pure desired partials
(2) Separation : subtracting undesired partials from a source very rich in partials
(3) Multiple Quality Generation : using a separate complex-wave generator for each desired timbre, and mixtures of these
(4) Formants
(5) Frequency-Amplification Control
(6) Envelope Control
It's flat and it folds — this tricky study of slender radio receiver design comes from Design Engineers, Inc., New York City, pioneers in this new style trend.
METAL-TUBE OUTLOOK REVIEWED BY EXEC
* Last month in these columns, the glass-tube policy of Philco was stated by Sayre M. Ramsdell, vice-president.
Below, Elmer T. Cunningham, president of RCA Manufacturing Company, Camden, N. J., reviews his company's policy with respect to metal tubes for the remainder of this year.
"One year's experience in the manufacture and use of all-metal tubes convinces us more than ever that this new design was a big step in the right direction. The advantages of the allmetal construction compared to a glass construction are definitely such that their value will appear increasingly important, particularly in the field of reliable short-wave reception.
"The all-metal construction is the only type that permits of inexpensive, uniform and definite shielding. The reduced size of the metal tube is already resulting in the development of smaller components, which will mean lower-cost receivers. Certain types of construction are possible only in the metal construction because of the more accurate dimensions obtainable in metal work.
"The high initial cost of metal tubes with respect to glass was a temporary handicap, but the relation of metal to glass cost is rapidly closing in and will thus overcome the most serious
obstacle to the broader use of metal tubes. Our own company (RCA), the General Electric Company, and many other prominent radio manufacturers are using metal tubes in nearly all of their production this season."
UPROAR TO ORDER
* Writers of radio scripts are supremely unconcerned about how much trouble they cause the sound effects experts. Their sketches demand everything from the slight peep of a just-hatched chick to the ghastly throb of an electric chair. If soldiers are involved, they can't march along the street — they traipse wearily through difficult mud, and the sound men get grayer and grayer trying to get a decent slop-slop.
Electrically transcribed sound effects are in general use, but somebody has to create them to start with. Al Sinton, chief of the department at World Broadcasting System, has been doing it for nearly 10 years and surrounded as he is by several dozen uncanny gadgets, now gets the real McCoy into World's programs. Airplanes idle, take off, and are followed in flight ; gold fish are heard to bubble, and tap dancers perform to rhythm. But if a script calls for smashing glass, Mr. Sinton hauls off and smashes it.
June, 1936
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