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.
Heinrich Rudolf Hertz. Heinrich Rudolf Hertz Published in Lenard Grosse Naturforscher Lehmanns Munich org html Photo first published at the latest Robert Krewaldt File Heinrich Hertz File Die Gartenlaube PDold Ccby Heinrich Rudolf Hertz
Page 2023 Free-images.com. All images are Public Domain