(animated stereo) Civil war Admiral D. D. porter, 1862-5
The purpose here is not to duplicate the original image, from the Library of Congress website, but to generate an animated gif to assist viewing. Unfortunately, animation is not automatic - to animate you must view the image at original resolution (click all sizes) or simply scroll down.
The library of congress offers a multitude of historical images online, many needing no license to redistribute. Two negatives (left plate, right plate) dating to 1862-1865 show Adm. David D. Porter, Lt. Commander, on deck of U.S. Steamship Fulton. Photographer: Samuel A. Cooley.
Admiral porter wsa one of the most noted naval officers of the U.S. civil war, receiving the Thanks of Congress on four separate occasions. At the time, this award was restricted to officers and the Medal of Honor was designated for enlisted men. Only 30 Thanks of Congress were awarded during the conflict.
Update: Andy Hall makes the case that this is, in fact, Captain Henry Gadsden of the transport Arago
Animated gif generated with StereoPhotoMaker, a freeware program by Masuji Suto & David Sykes