4 2 4 D O C U M E N T 4 4 2 J A N U A R Y 1 9 2 7 separation required for an explanation of the Earth’s magnetism is obtained when positive electricity repulses by less than negative electricity. c.) The same effect is obtained (Swann 1926)[11] by extending the Maxwell- Lorentz equations by the addition of two terms to the current density. In this way one obtains not only the terrestrial magnetic field but also the terrestrial electric field. The thus extended equations satisfy the conditions of the special theory of relativity and can also be easily modified in the way required by the general theory of relativity.—— I haven’t yet thought about which of these 3 points of departure is the best. They all come down to the same thing, of course, namely, that the Earth’s magnetism is formed by the rotation of charges. And that is what I hope to be able to test in the airplane experiment.— — — — I now have 2 requests of you, esteemed professor! 1.) The cost of the airplane experiment will amount to about 500 marks. Can you place this sum at my disposal through the Kaiser Wilhelm Institute? 2.) For 3 years I have been a teaching assistant in the mathematical seminar at the local university. The position is very pleasant but is compensated at only 146 marks a month. I currently still have a 1,200 marks debt from my period of study. [I mostly had to pay the costs of my studies myself.] I would finally like to pay off this sum now and for this reason would value a better-paid position. Could you not provide me with a physics assistantship from the Kaiser Wilhelm Institute? My present boss, Prof. Jung,[12] Halle (Saale), 8 Viktoria St., will certainly be pleased to provide detailed information about me. Respectfully and sincerely yours, Teodor Schlomka Attached 2 short offprints. 1 1021 ----------