English: Objective lens of a heliometer by Carl Bamberg, Berlin-Friedenau, around 1880/90. Lens diameter about 4.2 cm. (University Observatory Vienna)
Deutsch: Heliometerobjektiv, Carl Bamberg, Berlin-Friedenau, um 1880/90. Durchmesser der Linse 4,2 cm. Mikrometerschraube zum Verschieben der Linsenhälften. (Universitätssternwarte Wien)
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