U.S. Military telegraph operators at Petersburg, Virginia.

Wagon train of Military Telegraph Corps, Richmond, Virginia.

Signal Corps officers lowering flag at their camp near Georgetown, General Albert J. Myer in civilia…

Wagons and camera of Sam A. Cooley, U.S. photographer, Department of the South.

Col. Benjamin F. Fisher and staff on steps of Signal Corps headquarters, F St., NW, Washington, D.C.…

Central Signal Station, Winder Building, 17th and E Streets NW, and Signal Corps men, Washington, D.…

Col. Benjamin F. Fisher between two officers on steps of Signal Corps headquarters, 1816 F St., NW A…

Officers and clerks on a porch at Signal Corps headquarters, Washington, D.C. May 1865.

Signal Tower at Cobb's Hill near New Market, Virginia. 1864.

View from signal tower at Petersburg, Virginia. 1863.

 Signal tower at 14th New York Heavy Artillery headquarters Petersburg, Virginia.

Aerial View of battlefield from signal tower, Petersburg, Virginia.