Support for conferences on Physics and Astronomy, Vienna, 1905
25 positives plates, 100x85 mm, captions on mounts , in a waxed wooden box, 25cm x 10 x 12 cm
This company was the result of the collaboration in Vienna of G.A. Lenoir, (1850s-1911), microscope and instrument maker, and Karl Forster (1847-1906), manufacturer of physical instruments, chemist, art collector and violinist He had a villa built in Ober-St.-Veit (suburb of Vienna) with an observatory by Ferdinand Fellner Junior and Hermann Helmer
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