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:
Heaviside cropped. en Cropped from en Image Oliver Heaviside Transferred from org en Original uploader was Spinningspark at org en PDART PDArt PDOLD cropped Spinningspark Oliver Heaviside PDold original upload log page en Heavisidecropped Spinningspark bytes no from Image Oliver Heaviside PDold Oliver Heaviside