FLOWN ON LAST DAY OF CENTURY OF PROGRESS WORLD'S FAIR; MAIL WAS TRANSFERRED IN FLIGHT AT FAIR LAGOON. SIGNED ON COVER BY BOTH THE PILOT AND THE INVENTOR OF THE PROCESS, DR. LYTLE ADAMS, A DENTIST FROM IRWIN PA.
IRWIN ALSO DEVELOPED THE "BAT BOMB" FOR USE IN WORLD WAR II. THE BOMB WAS A LIGHTWEIGHT CANISTER WHICH HOUSED OVER A THOUSAND BATS; IT WOULD BE DROPPED OVER JAPAN WHERE MANY OF THE BUILDINGS WERE WOODEN AND NATURALLY FLAMMABLE. AS THE BOMB FELL, THE BATS WOULD WARM UP AND AWAKEN. AT ABOUT 1000 FEET, THE CANISTER WOULD RELEASE THE BATS, EACH OF WHICH CARRIED A SMALL TIMED DELAY NAPALM INCENDIARY DEVICE. THE THEORY WAS THE BATS WOULD SEEK SHELTER IN THE BUILDINGS AND SMALL FIRES WOULD ERUPT AS THE NAPALM WOULD IGNITE. THE PROJECT WAS APPROVED BY PRESIDENT ROOSEVELT AND THE GOVERNMENT SPENT 2 MILLION DOLLARS DEVELOPING IT. IN 1943 THE NAVY TOOK OVER THE PROJECT AND USED THE CODENAME "PROJECT X-RAY". ULTIMATELY THE WEAPON WAS NEVER PUT INTO USE AND THE GOVERNMENT OPTED TO CONCENTRATE ON THE ATOMIC BOMB.
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