British industrialist and engineer (1810-1900) who invented high-pressure hydraulic machinery and revolutionized the design and manufacture of guns, and became the first scientist to join the House of Lords. Handsome 2.5 x 4 carte-de-visite portrait of Armstrong by W. & D. Downey of London, signed on the mount in ink, "W. G. Armstrong." In fine condition, with light speckled spotting to the image.