New-York tribune., 1922-08-27
important Role Of
Copper in Radio
Told in Renor,
Association Bulletin s.,.
Radio New Assuming III
Status of Steady, ReI;ahl.. Il.
Industry and Ut;l;,s.

The part played by copper aa1
in the development Of radio s'sss
is described in the bulletin - s',as
Copper and Brasa Research as.s
ton, just published The report So go.
Radio is not waning in publ;e
terest; it is merely settling da,. =
the steady gait that denotes an ;.a..a IL y
try which has found its stride I.I
sloughed Of the aspects Of .'ss =
and assumed the characteristics. =
full-fedged industry.
People have now had opporsn,;.
Judge values by results, TSs y y
useful, efficient materials and ,aasss'
isms are proving them sefgsse sssaass y
others are being discarded. as
This has been so in all nev ~
trles--but because radio has as.,sss', 10y,
a perfect tidal wave of interest 's.ss sss
process Of valuation has besn 80 -
quicker and more widespread thar Nv W.
peoIsle believed possible. ''ss'
Large demands are reported !.
manufacturers Of copper wirs ~, y
tube ard bar stock for coune, :, v"ssA 81
form or another for use +, radio sas
paratus- As'
There is not single instrnn.a.s
radio sending or receiying sas go !. z.
what requires copper. brass az 49,
IN It's construction The high electre,I
eonductivity OF copper makes It assss
lutely essential for all switches III
parts using wire to convey the delis.ss
electrical impulses received from a.
air. Brass, because Of the esss uis.
which it can be machined. il laryeis
used for binding posts, plugs. ss ausisy
bulb bases and the like. Whare upnauaI srs.i
strength is requirement phosuhay !.
silicon bronze finds vide appiicstion
Sheet copper and brass are used II
the construction OF the adiustibIe saw
densers that assist in increasing IL
strength OF The electrical imaSlsss
From one to three condensaYs os -
to thirty plates each are neessssry
to the average amateur receiving sts.
tlcn. The plates are semi-cirruiar n
shape, with a diameter Of feay n
five inches and OBS inch thick.
Perhaps copper's greatest usefuInes.
in radio telephony, however. i n
antennae or aerials for ;nteyceps;ry
the. electrical impulses transmittss
from one station to another. AID
probably in no other commercial spuls.
cation is copper called upon TO stsna
up under such severe conditions as arc
found in antennae service. II must
resist the corrosive action due 10 ysry.
ing climatic conditions and must have
sufficient strength to withstand tts
strains due to wind pressure and rs
own weight when suspended in long
spans.
Most radio enginsers have cone !,
agree that for short span aerials the
most satisfactory material is Ns. Il
or No. Is bare copper wire. Exberi.
ments conducted by the United States
Bureau of Standards have led to the
same conclusion. Furthermore, the
slight difference in first cost Is more
than Offset by copper's urifsrm.
lasting service.
For large anternae phosphor brenle
stranded wire has given nost salts
factory service, the best size beng
seven strands of No. 20 or 22. pre-
viding q larger copper surface for
catching the electrical waves in the
ether. Another advantage Of this kind
of aerial lies in the fact that. dse to
its stranded construction, this form Of
aerial absorbs considerable stress be-
fore the metal itself begins TO stretch.