YOU MAY NOT KNOW. By
R. ROSEMAN
and
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B. W. ALLAN
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11
T H E S U N S E T T W I C E F O R H I M T H A T DAY
1
J. A. C. CHARLES 1746-1823
" A n excellent citizen, a n honest man i n every eoenf of his life, an ingenious physicist, and a peerless -ARAGO chemist."
"All those who knew him fake ppleuure in speaking of his talents, his noble, amiable, and generous char-FOURIER acter."
1. L. GAY-LUSSAC
TIlE ,\SCEKT OF CHARLES AND ROBERT, D ~ c ~ w l c1,n 1783
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HORTLY BEFORE TWO O'CLOCK ON DECEMBER 1, 1783, THERE ROSE FROM THE TUILERIES GARDENS, PARIS, THE FIRST PASSENGER-CARRYING HYDROGEN BALLOON-A "TRULY SCIENTIFIC CREATION, WHICH ADVANCED A E R O S T A T I O N FROM TOTTERING INFANCY ALMOST TO FULL PRIME." ON THIS FIRST SCIENTIFIC A E R I A L VOYAGE I N HISTORY, THE INVENTOR OF THE CRAFT, CHARLES (WHO, IN 1787, WAS TO ANTICIPATE GAY-LUSSAC'S LAW OF EQUAL THERMAL EXPANSION OF GASES), WITNESSED A DOUBLE SUNSET. "IT MUST HAVE- BEEN A SUN SUR-
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N SEPTEMBER 16, 1804, IN A BALLOON ASCENT FROM THE GARDEN OF THE CONSERVATOIRE DES ARTS, PARIS, UNDERTAKEN "SOLELY FOR OBJECTS OF SCIENCE," GAY-LUSSAC ATTAINED THE TREMENDOUS ALTITUDE OF MORE THAN 4.3 MILES-"1600 FEET HIGHER THAN THE SUMMIT OF THE ANDES. MORE ELEVATED THAN THE LOFTIEST PINNACLE OF OUR GLOBE A N D FAR ABOVE T H E H E I G H T TO WHICH ANY MORTAL HAD EVER SOARED."
