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(title 17, U. S. Code).
(PHOTOGRAPHY). (MILITARY). KNECHT. Half-Plate Oval Ambrotype by Knecht, Patent July 4 & 11, 1854, in Old Padded Case, of Posed Bearded Officer Holding a Sword in Two Hands, 4.5" x 3.5.". $1,250.00
The process for making ambrotypes was invented in 1851, and is the same technique as that used to make an albumen glass negative. In this instance the glass is backed with black paper or metal and mounted in a daguerreotype case. This is a fine, early work of an unidentified military officer.