
Signal Tower on Elk Mountain, Maryland
1862
Among the earliest Civil War photographs, the image demonstrates how signal towers became crucial communication networks, while establishing O'Sullivan's reputation for technical precision under wartime conditions.
- Medium
- Albumen print, pl. 22 from the album "Gardner's Photographic Sketch Book of the War, vol. 1" (1866)
- Location
- Art Institute of Chicago, Chicago, IL
More by Timothy O'Sullivan
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Artists in conversation

Alexander Gardner
American · b. 1821

Gardner was O'Sullivan's direct collaborator and publisher of the very album this photograph appeared in, creating albumen print documentary photographs of Civil War landscapes, military architecture, and battlefield conditions with the same technical precision and historical gravitas.
Mathew Brady
American · b. 1822
Brady pioneered large scale documentary Civil War photography using albumen print processes, capturing military infrastructure, landscapes, and architectural subjects in black and white with the same commitment to historical record and technical rigor as this specific image.

George N. Barnard
American · b. 1819

Barnard produced iconic albumen print documentary photographs of Civil War military structures and landscapes in the American South, sharing O'Sullivan's approach of combining architectural subjects within sweeping natural terrain to convey wartime historical significance.
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