ALS in German, signed “Albert,” one page, 3.5 x 5.5, October 1, 1924. Letter to "Herrn und Frau Winteler," his sister Maja and her husband Paul (familiarly called "Pauli") in Italy, written from Lucerne. In full (translated): "Albert Karr gave me Pauli’s letter, which is already a year old. I was very happy about everything it said. Since I see that you are so brave, you shouldn’t give me back the 1000 francs; I can get the money more easily than you. The lady boarders will come soon; I believe that you’ll be happy with them, since (I believe) they’ll be a good fit for you, better than young girls, who still have a lot of fanciful ideas in their heads. Here there’s a conference of Swiss natural scientists to which I’m invited. Then I’m going to see Uncle Caesar and to Leiden." In fine condition, with an unobtrusive central horizontal fold.
Einstein was in Lucerne to attend a conference of the Swiss Naturalist Society on October 4th, where he presented his important paper 'On the Ether.' In the paper, Einstein made the philosophical point that although relativity killed off the luminiferous aether as the supposed medium of electromagnetic vibrations, it still imbued the vacuum with specific physical characteristics, such as curvature and energy. A fantastic piece of Einstein family correspondence.
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