Millikan, Robert Andrews
Quantum Theory / Particle Physics
radiation, Planck, X-Rays, photo-electric effect, Thomson, Bragg
We know that there is a vehicle for the transmission of electromagnetic energy, but we know nothing whatever about its structure and it has been customary to assume that it has none. To deny the existence of this vehicle, which we have been in the habit of calling the ether, and to use the word ''vacuum'' to denote all the properties heretofore assigned to it by the experimentalist, viz., those of transmitting electromagnetic disturbances, is a bit of sophistry in which he is little interested. We seem to be on the eve of learning something more -about the properties of this vehicle, call it by what name you will, than we have known heretofore.