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.
Kapillarelektrometer. en Lippmann electrometer designed by Gabriel Lippmann in Heidelberg Germany de Kapillarelektrometer von Gabriel Lippmann in Heidelberg entwickelt none author PDold Electrometers
Page 2023 Free-images.com. All images are Public Domain