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ALBERT EINSTEIN (1879-1965)
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ALBERT EINSTEIN (1879-1965)

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ALBERT EINSTEIN (1879-1965)
Ist die Trägheit eines Körpers von seinem Energieinhalt abhängig?, offprint from: Annalen der Physik, 4th series, vol. 18, pp. 639-641. Leipzig: Metzger & Wittig for Johann Ambrosius Barth, 1905. 8° (221 x 142mm). (Short marginal tears, light marginal browning.) Original printed wrappers (some chips and tears on edges, spine split). Provenance: Hans Albert Einstein (1904-1973, inkstamp on upper wrapper 'Dr. H.A. Einstein 1090 Creston Road Berkeley 8, Calif.'; numbered and dated in ink and pencil '5' and '27 . IX . 05' on the upper wrapper, possibly by Hans Albert Einstein). FIRST SEPARATE EDITION. BRL 9; Weil 10.

Das Prinzip von der Erhaltung der Schwerpunktsbewegung und die Trägheit der Energie, offprint from: Annalen der Physik, 4th series, vol. 20, pp. 627-633. Leipzig: Metzger & Wittig for Johann Ambrosius Barth, 1906. 8° (222 x 143mm). (Light marginal browning.) Original printed wrappers (extremities lightly chipped, spine split). Provenance: H.A. Einstein (inkstamp on upper wrapper; numbered and dated in ink and pencil '8' and '17 . V . 06' on the upper wrapper, possibly by H.A. Einstein). FIRST SEPARATE EDITION. BRL 13; Weil 13.

Über die vom Relativitätsprinzip geforderte Trägheit der Energie, offprint from: Annalen der Physik, 4th series, vol. 23, pp. 371-384. Leipzig: Metzger & Wittig for Johann Ambrosius Barth, 1907. 8° (222 x 145mm). (Light marginal browning.) Original printed wrappers (edges slightly chipped). Provenance: H.A. Einstein (inkstamp on upper wrapper; numbered and dated in ink and pencil '13' and '14 . V . 07' on the upper wrapper, possibly by H.A. Einstein). FIRST SEPARATE EDITION. BRL 19; Weil 19.

FIRST SEPARATE EDITIONS. THREE RARE OFFPRINTS FROM THE LIBRARY OF EINSTEIN'S SON, PRESENTATION COPIES, with 'Überreicht vom Verfasser' printed on upper wrappers. These three papers form a series, tracing Einstein's progress towards the formulation of the equation E=mc2. In Ist die Trägheit eines Körpers von seinem Energieinhalt abhängig? Einstein explored the relationship between the loss of kinetic energy and the emission of radiation energy, concluding that, 'the mass of a body is a measurement of its energy content. Differences in its energy content equal differences in its mass in accordance with the equation \KD\kE=\KD\kmc2' (DSB IV, p. 323). Einstein pursued his exploration of the mass-energy law further (including in Das Prinzip von der Erhaltung der Schwerpunktsbewegung und die Trägheit der Energie), and 'in 1907 he carried this viewpoint one step further, assuming that mass and energy are completely equivalent concepts, the rest mass of a body being a measure of its "latent" energy content in accordance with the famous equation E=mc2' (loc. cit.); the first statement of the equivalence principle occurs in a footnote on p. 382 of the third paper here: 'Es ist zu beachten, daß die vereinfachende Festsetzung \Km\kV2=\Ke\k<->0 zugleich der Ausdruck des Prinzipes der Äquivalenz von Masse und Energie ist, und daß im Falle des masselosen elektrisierten Körpers \Ke\k<->0 nichts anderes ist als seine elektrostatische Energie'. All of these offprints are rare: Weil states that: 'it seems certain that there were few before 1914. They were given only to the author, and mostly "Überricht vom Verfasser" (Presented by the Author) is printed on the wrapper' (p. 4); for Hans Albert Einstein, see the footnote to the previous lot. (3)
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