2 7 4 D O C U M E N T 2 7 7 O C T O B E R 1 9 2 8 The right-hand side can be taken in place of the Lorentz approach. If now is nonzero and spacelike, then for the force, one obtains i.e., only the elec- trostatic component, but not the electrodynamic one. Our experiment would give a negative result, according to this hypothesis. But this approach cannot explain Far- aday induction I simply wanted to show that the Lorentz approach is not a self- evident result of the Maxwell equations.— The experiment sketched above is rather a test of whether the derivatives of the do not enter in the force approach for a vanishing of the average torque—in case it were to be observed—would demonstrate that the integral given above should be replaced by . Although a confirmation of the Lorentz approach is the most likely outcome, it is still not a priori certain that an experiment is unjustified, in particular since it would not be very difficult to carry out.[5] Best regards, your Einstein P.S. I will notify you immediately when Lanczos answers.[6]  4   4 x  -------- -    d F dt --------------dt