The Formulæ
Observations
Separate results of Groups of Observations
Discussion of Errors
Objections Considered
Postscript




Experimental Determination of the Velocity of Light.

By Albert A. Michelson, _Master, U.S.N._



Introduction.



In Cornu's elaborate memoir upon the determination of the velocity of
light, several objections are made to the plan followed by Foucault, which
will be considered in the latter part of this work. It may, however, be
stated that the most important among these was that the deflection was too
small to be measured with the required degree of accuracy. In order to
employ this method, therefore, it was absolutely necessary that the
deflection should be increased.

In November, 1877, a modification of Foucault's arrangement suggested
itself, by which this result could be accomplished. Between this time and