Author: SCHWERD, F.M.
Title: Die Beugungserscheinungen aus den Fundamentalgesetzen der Undulationstheorie analytisch entwickelt und in Bildern dargestellt. von F.M.Schwerd. Mit 18 zum Theil illuminirten Tafeln.
Description: Mannheim, In der SCHWAN und GOETZ'schen Hofbuchhandlung, 1835. 4to. W. 18 fold. lith pls. (of which 2 coloured). (Pls. foxed). Original blue letterpress printed wrappers, upper cover w. typogr. decorated border, spine renewed in matching blue grey paper. Upper wr. righthand margin a few small chips, a little frayed, a few spots; in ink the year '1851' [sic!] on upper wrapper. [...]. (XII, 144, VIII pp.). (Text some foxing, corners of pages a little dogeared.). (Uncut.). (Inserted 1 leaf, letterpress on recto only, containing the rare advertisement drawn up by Schwerd in which he offers for sale the apparatus/ equipment needed to execute his experiments, the so called 'Beugungsapparate'; These technical devices constructed upon request '...werde Ich die hierzu erforderlichen Apparate unter meiner Leitung verfertigen lassen.'). Darmstaedter, 418: 'Schwerd wendet die Theorie der Beugung auf die mannigfachigsten Beugungserscheinungen des Lichtes an und trägt so zur Stütze der Undulationstheorie bei.': Pogg. II, 878: Rosenberger, Gesch. der Physik II, 193:'Eine Deduction der Gittererscheinungen aus der Hypothese der Undulationstheorie und damit eine experimentelle Bestätigung dieser Theorie gelang zuerst Schwerd in seinem berühmten Werke: "Die Beugungserscheinungen" ... Schwerd zeigte, dass alle diese mannigfaltigen Erscheinungen rein deductiv abzuleiten seien and dass dadurch die Undulationstheorie so vielfach als nur denkbar bestätigt werde. Danach verstummten auch die letzten Einwendungen gegen diese Theorie.': Houzeau & Lancaster II, 1644: Schwerd's famous theory played an instrumental part nearly 100 years later in M. von Laue's famous theory of x-ray diffraction. It was based on Fraunhofer's experiments and on Frenel's principles. DSB VIII, 50 - 53: Max von Laue. 1879 - 1960. Theoretical physics. 'I was plunged into deep thought as I walked home along Leopoldstrasse just after Friedrich showed me this picture. Not far from my own apartment at Bismarckstrasse 22, just in front of the house at Siegfriedstrasse 10, the idea for a mathematical explanation of the phenomenon came to me. Not long before I had written an article for the Enzyklopaedie der mathematischen Wissenschaften in which I had to reformulate Schwerd's theory of diffraction by an optical grating (1835), so that it would be valid, if iterated, also for an cross-grating. I needed only to write down the same condition a third time, corresponding to the triple periodicity of the space lattice, in order to explain the new discovery. ...': Schwerd's famous theory played a crucial role in Max von Laue's formulation of his theory of x-ray diffraction 100 years later.

Keywords: optics undulationtheory strongbox? rays W67 bdrb