John Henry Poynting

Credit:

from Oliver Heaviside: Sage in Solitude (ISBN 0-87942-238-6), p. 117.

Krótki link:

https://plwiki.pl/b/dd19a

źródło:

Wikimedia Commons

Wymiary:

554 x 754 Pixel (102557 Bytes)

Licencja:

Public domain

Komentarz do licencji:

Attribution is not provided for the image, but its age implies that it's public domain. (It must have been made in 1914 or earlier.) It was scanned on an Epson Perfection 1250 at 400dpi, cleaned up (some text was showing through the back) in Photoshop, reduced to grayscale, and saved as JPG using the 'Save for Web' optimizer. (From Grendelkhan)