Max von Laue

“ We can compare its field with an angle-lever, its material parts with the shell. Neither the electromagnetic momentum of one part, nor the mechanical momentum of the other part, is parallel to the velocity, therefore both need a torque for their translatory motion. However, since momentum as a whole is parallel to velocity, both momentum components (perpendicular to the velocity) are oppositely equal to one another, and the same holds thus for the torque. ”

“ The totality doesn't require any torque, it rather represents (as in the model consisting of angle-lever and shell) a "completely static system" [10] , which obeys the dynamics of the mass-point for stationary and quasi-stationary translatory motions.
That the momentum of the angle-lever has not the direction of its velocity, is also given by another consequence, which appears to be paradox in Newton's dynamics. ”

“ In general, the increase of angular momentum is
[7]
by which the fact can be confirmed again, that the component of (parallel to ) doesn't matter.
Eventually, we imagine that the lever is in a shell, at which an axis of rotation is mounted, and from which – for example by strained springs – forces and are exerted. The energy current considered above, is continued in the axis after it left the lever at , then it enters the shell through the mounting locations of the axes, from there it enters the spring which affects the lever at , and thus it is closed. ”