The Transverse Momentum of an Electron

WHEN Newton's third law is applied to an electron, it makes where M is the ``momentum'' in the field, or that part of the time integral of the force on the ether which is in the field, or , and N is the momentum already wasted, whilst F is the applied force on the electron. Similarly, Newton's fourth law (or the Scholium to the third) makes if u is the velocity of the electron, U the electric and T the magnetic field energy, and W the rate of waste of energy.