To see the medium (449 x 500) animated image scroll down to the first comment below; to see the large (798 x 888) view original size (look above in the "actions" menu).
The Library of Congress website offers a multitude of historical images, many with no known restrictions on use. This image is derived from two 1864 glass stereograph negatives titled Fort Brady, Va. Three officers of the 1st Connecticut Heavy Artillery. These men served in company C. An interesting historical recollection, First Connecticut Heavy Artillery, Historical Sketch and Present Addresses of Members, was written by E. B. Bennett, who served in company K..
The purpose here is not to duplicate the original image, from the Library of Congress website, but to generate a downloadable animated gif to assist viewing and presentation. The original image has no known restrictions on use. Library of Congress web address for this image: www.loc.gov/pictures/item/cwp2003000513/PP .
Image manipulations and gif generation done with StereoPhotoMaker, a freeware program by Masuji Suto & David Sykes.