76THE NORMAL ADVANCEor disc, having 720 teeth, which could be set inrapid, measured rotation. When this wheelwas at rest, light passed between...
withdouble the velocity it was again visible
withtreble the velocity it was again eclipsed, etc.Now, it is evident that the speed of light in airis to that of the tooth, at th...
accordinglyso soon as the mirror began to rotate with considerable speed, the coincidence between thewires and their images was destroyed, and th...