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 crystal models to Christian Samuel Weiss (1780-1856) who was professor at the University of Berlin.
private collection
![Wooden models of twinned feldspar crystals, G.E. Kayser, Berlin, 1834](images/Kayser_feldspar_1.jpg)
18 rotatable wooden models of twinned feldspar crystals in cardboard box
![Wooden models of twinned feldspar crystals, G.E. Kayser, Berlin, 1834](images/Kayser_feldspar_2.jpg)
cover of the carboard box
![Wooden models of twinned feldspar crystals, G.E. Kayser, Berlin, 1834](images/Kayser_feldspar_3.jpg)
inside of the cover
![Wooden models of twinned feldspar crystals, G.E. Kayser, Berlin, 1834](images/Kayser_feldspar_4.jpg)
Kayser's autograph dedication to Christian Samuel Weiss
![Wooden models of twinned feldspar crystals, G.E. Kayser, Berlin, 1834](images/Kayser_feldspar_5.jpg)
rotatable wooden models of twinned feldspar crystals