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Mach
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1967 William Knight sets X-15 speed rec of 7,297 KPH/4,534 MPH/Mach 6.72
1959 USAF rocket-powered rail sled attains Mach 4.1 (4970 kph), New Mexico 1953 Chuck Yeager reaches Mach 2.43 in Bell X-1A rocket plane 1953 Scott Crossfield in Douglas Skyrocket, 1st to break Mach 2 (1,300 MPH) 1947 Chuck Yeager in Bell XS-1 makes 1st supersonic flight (Mach 1.015) 1916 Ernst Mach, Austrian physicist/philosopher/psychologist, dies at 78 1898 John Ames Sherman patents 1st envelope folding and gumming mach (Mass) 1895 Charles T Stork, great industrialist (cotton mach factory), dies at 73 1838 Ernst Mach, Chirlitz-Turas Austria, physicist/philosopher/psychologist |
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