The J. Paul Getty Museum
George M. Mowbray
License, verbatimCC0
The J. Paul Getty Museum: image dedicated to the public domain under Creative Commons Zero (CC0), stated on the media record itself ('Rights for Media'), with download clearance.
George M. Mowbray. Tr-Nitro-Glycerin, As Applied in the Hoosac Tunnel, Submarine Blasting, Etc., 1872. The J. Paul Getty Museum.