This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
GttingenLinse..Zoll. Description Gttingen Stadtmuseum inchlense Used by Lichtenberg Author Ingersoll photo taken myself Note asked the staff for the permission to take photos on May They granted me the permission with the condition not to use flash Anmerkung Ich fragte die Aufsicht am Mai ob ich Fotos machen darf und sie erteilten