Aug - AmericanRadioHistory.Com

African Torture Test
proves L ° Ft cfaudiatapa
immune to extreme heat and humidity
"The Iturf Forest provides the
worst possible conditions for
recording work. Our camera
lenses grew mushrooms, even
on the inner surfaces. All
leather molded in four days.
Our acetate -base tapes became
unuseable. But the I.R Audio -
tape always unwound without
sticking and showed no tendency
to stretch or curl."
COLIN M. TURNBULL, noted explorer, made the above comments on his recent return front a year -long
recording expedition through the arid deserts and steaming jungles of Africa, where Audiotape on
"Mylar-- polyester film was subjected to the -'worst recording conditions in the world." Its performance
speaks for itself.
Here's positive proof that all hot -weather recording problems
can be entirely eliminated by using the new LR Audiotape
on Mylar* polyester film.
During his trip from Morocco to East Africa, through the
Gold Coast and the Congo, Mr. Turnbull recorded 45,000 ft.
of Audiotape on 1 and 2 mil "Mylar ". Not an inch of it gave
any trouble, either in desert sun (125° temperature, 25%
humidity) or in the Congo forests (85° temperature, 90;í
humidity).
That's a real torture test for tape and proof of the superiority
of the new, longer recording Type LR Audiotape.
Made on tough but thin 1 -mil "Mylar ", it gives you 50¡f
more recording time per reel, yet is actually far stronger than
11/2-mil acetate -base tape under humid conditions. For better
recording in any season, ask your dealer for "Mylar"
Audiotape -now available in 1, 11/2 and 2 mil base thickness.
Write or ask for a copy of Bulletin No. 211 containing complete
specifications.
AUDIO DEVICES, Inc.
444 Madison Avenue, New York 22, New York
Offices in Hollywood - Chicago
Export Dept., 13 E. 40th St., N.Y. 16, N.Y., Cables "ARAB"
Table I
1 mil Acetate
0.9 mil Mylar
145 mil Acetate
TESTS AT 75 F, 50% RELATIVE HUMIDITY
Yield Strengt4
37Ib
4 2 16
50Ib
breaking Strength
3.9 lb
7: lb
5 5 lb
Table II TESTS AT 75 F, 90% RELATIVE HUMIDITY
Yield Strength
Breaking Strength
1 mil Acetate El
0.9 mil -
Mylor
1.45 mil Acetate
4I lb
The above test data. taken under conditions of both
.sinter and summer humidity, show the marked
superiority of 1- mil "Mylar," not only over the thin
cellulo -e acetate base, but over the standard 1.45.
tail acetate as well.
*DuPont Trade Mark