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Wooden models of twinned feldspar crystals



G.E. Kayser, Berlin, 1834
18 rotatable wooden models of twinned feldspar crystals (all ~2.7 x 2.2 cm) with face symbols in brown ink  in a grayish paper covered cardboard box (19.5 x 10.1 x 1.6 cm).
The cover bears a label "G.E. Kayser: | Zwillingsgesetze der | ein- u. eingliedrigen | Feldspathgattungen. | 1834." and an inscription in the top right corner "Inventar 1. | VI 640-677". Inside the top left of the cover is Kayser's autograph dedication "Seinem verehrten Lehrer, | dem Herrn Professor Weiss | Kayser. | 1834." and also a text in another hand "Zur Inaug. Dissert. von Dr. G.E. Kayser, Berlin 1834. | [vgl. Poggendorff, Handwörterbuch I, 1233.] | identisch in Pogg. Ann. 34, 109, 301; 1835. | Ueber einen Cyclus von Zwölf Zwillingsgesetzen, nach welchen die Krystalle der ein- und eingliedrigen Feldspat- | gattungen verwachsen."

On the occasion of his inauguration in 1834, Gustaf Eduard Kayser (1803-?) presented this set of wooden crystals to Christian Samuel Weiss (1780-1856) who was professor at the University of Berlin.

Wooden models of twinned feldspar crystals, G.E. Kayser, Berlin, 1834
18 rotatable wooden models of twinned feldspar crystals in cardboard box


Wooden models of twinned feldspar crystals, G.E. Kayser, Berlin, 1834
cover of the carboard box


Wooden models of twinned feldspar crystals, G.E. Kayser, Berlin, 1834
inside of the cover


Wooden models of twinned feldspar crystals, G.E. Kayser, Berlin, 1834
Kayser's autograph dedication to Christian Samuel Weiss


Wooden models of twinned feldspar crystals, G.E. Kayser, Berlin, 1834
rotatable wooden models of twinned feldspar crystals


Collection: private collection