The Original Gyroscope
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Date | Investigator | Method | Result (km/s) (Error) |
1849 | Fizeau | Rotating toothed wheel | 313,000 (5000) |
1850 | Foucault | Rotating mirror | 298,000 (2000) |
1875 | Cornu | Rotating mirror | 299,990 (200) |
1880 | Michelson | Rotating mirror | 2990,910 (159) |
1883 | Newcomb | Rotating mirror | 299,860 (30) |
1928 | Mittelstaedt | Kerr cell shutter | 299,778 (10) |
1932 | Pease and Pearson | Rotating mirror | 299,774 (2) |
1940 | Huttel | Kerr cell shutter | 299,768 (10) |
1951 | Bergstrand | Kerr cell shutter | 299,793.1 (0.3)
Reference: 'Introduction to Modern Optics, by Grant R. Fowles, Dover Publications, NYC, 1989, p6 Answered by: I would like to add that the speed of light has finally been defined to be 299 792 458 m/s, exactly. This is done since we believe c to be a true constant of nature. So, now, the definition of the meter is directly dependent on the definition ![]() Carl Sagan (1934-1996) © Copyright 1995-2019 PhysLink.com
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