Relativitaetstheorie: 1911-1914: Entwurftheorie

Relativitaetstheorie: 1911-1914: Entwurftheorie

Einstein's Fountain-Pen

Einstein used this fountain-pen for many years, especially between 1912 and 1921 - so that all his concepts and calculations about the Theory of General Relativity and Gravitation from that time have been written with this pen. He gave it to me in 1921.Paul Ehrenfest

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