...distance through which the luminous ray passed between the two reflections from the revolving mirror. He described the toothed wheel of Fizeau, and the...this method. He found that it was impossible to give an uniform motion to the toothed wheel, and therefore adopted an electrical registering apparatus to...

...this arrangement an exact uniform motion is no longer necessary, the observer being able by signal to point out the instant at which the right velocity is obtained. His second improvement is the substitution of a pair of observations of the return rays, when reduced...

...passed between the two reflections from the revolving mirror. He described the toothed wheel of Fizesu, and the improvements which he had himself made in...this method. He found that it was impossible to give an uniform motion to the toothed wheel, and therefore adopted an electrical registering apparatus to...

...distance through which the luminous ray passed between the two reflections from the revolving mirror. He described the toothed wheel of Fizeau, and the...electric signal enabling the observer to point out at the instant at which the right velocity is obtained. Another very important improvement is the substitution...

...exact uniform motion is no longer necessary, the observer being able by a peculiar electric signal to point out the instant at which the right velocity is obtained. The second improvement, and one very important for the exactness of the method, is the substitution...

...exact uniform motion is no longer necessary, the observer being able by a peculiar electric signal to point out the instant at which the right velocity is obtained. The second improvement, and one very important for the exactness of the method, is the substitution...