Statistics for occurrence #1 of “T. J. Lockwood” in chapter 6, page 97 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 5: Forts and Artillery.:

... 1862. It left for Washington on February 10th. Its first Camp was five miles from Chain Bridge, and its second at Fort Marcy. These unusually clear photographs were treasured half a century by T. J. Lockwood , a member of the regiment. Marcy was the northernmost Fort on the west side of the Potomac, lying above Chain Bridge. Its armament consisted of three 24-pounders en barbette, two 12-pounder...
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