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Aluminum Contributes to Radio
^Lightness, Beauty, Finer Results
Manufacturers of the finest sets are using Aluminum in constantly increasing quantities. Their tests have demonstrated that Aluminum is the one metal that most efficiently meets the widely differing conditions encountered in radio design.
Its lightness; its permanent beauty; the fact that it does not rust or corrode; its high electrical conductivity; its efficient shielding quality; its "workability"— all are advantages that combine to make Aluminum the ideal metal for radio.
In many of the most advanced receiving sets Aluminum Shields are used to achieve better tone quality, greater selec]/\J tivity, closer tuning — in short, finer reception.
Aluminum shielding reduces interference. It eliminates electrostatic and electro-magnetic interaction between various stages of radio-frequency amplification. It eliminates modulation of radio frequency stages by feed-back from audio-fre
quency amplifier. It makes possible more compact design.
Aluminum performs these functions efficiently and adds jG»iib3ih_5 less to the weight of the than any
set
v •• ' — it_Jf substitute metal. Moreover, it is easily worked into special shield shapes — cans, boxes or casings. Thus it presents few limitations of size and shape.
It allows the engineer great freedom to design his shielding to meet, ideally, the various requirements of his set.
Aluminum is widely used for variable condenser blades. Aluminum Company of America produces special sheet Aluminum for this purpose that is accurate and uniform beyond anything hitherto attained. Gauge tolerance in
«^i=fl fESfl /».
thickness is ---- ^ j
+ .001 inch and " the total variation within one sheet is limited to .0005 inch.
Aluminum Company of America also makes finished condenser blades from this highly accurate and uniform sheet.
The leading manufacturers of foil and paper fixed condensers now use Aluminum foil because of its high electrical conductivity and its great covering area (a pound of Aluminum foil .0003 inch thick covers 34,000 square inches). Terminals can readily be soldered to Aluminum foil condensers by a process recently developed by Aluminum Company of America.
Alumac Die Castings of Alcoa Aluminum combine lightness, strength, accuracy and high conductivity. They have equal strength with less than half the weight of other casting materials. They are used with complete success for loud speaker frames and bases, condensers and condenser frames, drum dials, chasses — and even for cabinets.
There is a fund of information on the use of Aluminum inradio,and on radio in general, in the new edition of "Aluminum for Radio." copy of this interesting will be mailed on request.
Your book
ALUMINUM COMPANY OF AMERICA
ALUMINUM IN EVERY /^g^COMMERCIAL FORM 2464 Oliver Building rajnr) Pittsburgh, Pa.
ALUMINUM
cThe mark, of Quality in Radio