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Radio Insulators²
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·Back Cover
Pyrex Radio Insulators
    The surface of PYREX Radio Insulators furthermore has no added glaze to craze or crack and no pores to pit. The surface and body are one homogeneous and uniform structure.
    In the textile and other industries the extremely hard surface of PYREX equipment is utilized for parts where excessive wear occurs, and this same factor is the reason why PYREX Radio Insulators are unscarred by wind-blown sand or ice.
    The stability of PYREX Radio Insulators against corrosive influences renders them immune to the attack of acid fumes, smoke, fog and salt sprays. For this last reason, PYREX Insulators are widely used for marine communication systems.
    PYREX Radio Insulators, because of their coefficient of expansion of 0.0000032 between 19 deg. C. and 350 deg. C., which is lower than that of any manufactured substance with the exceptions of fused quartz and Invar steel, are indifferent to heat shock and abrupt temperature changes. Tropical sunshine does not create strains within them. The sudden chill of a summer hail storm does not affect them.

With Commander Byrd at the North and South Poles

    Commander Byrd and his technical advisers so clearly recognized the importance of these combinations of characteristics that the radio equipment taken on the Byrd Arctic expedition was equipped with PYREX Radio Insulators. Similarly, the airplane, America, in which Commander Byrd flew across the Atlantic Ocean, was equipped with PYREX Insulators.
    After these two grueling tests it was indeed a striking tribute to their worth that Commander Byrd equipped his Antarctic expedition with PYREX insulators exclusively. It was on this expedition that Commander Byrd established the extraordinary record of two-way communication between his plane, Stars and Stripes and the New York Times Radio Station in New York City, 10,000 miles away. Commander Byrd and Lieutenant Hanson, Radio Engineer of the expedition, both feel that their confidence in PYREX Radio Insulators has been amply justified.