ARTHUR ADEL - SPECIAL COVER SIGNED - HFSID 47237
Price: $100.00
ARTHUR ADEL. Philatelic Envelope signed: "Arthur Adel",
6½x3½. Cover bearing 13-cent stamp, pictorially postmarked at the Midwest
Postage Stamp & Coin Show Sta., Chicago, IL, April 17, 1977. Postmark
captioned: "Today-The Planets/One Day-The Stars". Astrophysicist Arthur Adel
(1908-1994) discovered the 20 micron "window" in the Earth's atmosphere and
discovered that nitrous oxide is nature's device to control the ozone in the
atmosphere. He also researched the spectra of Uranus and Neptune and made the
first in-depth study of atmospheric absorption of solar radiation. Glue of right
back flap shows through to blank area. Fine condition.
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