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细节
Beard patentee lens
lacquered-brass barrel (lacks focusing pinion), the barrel engraved R. BEARD. SOLE PATENTEE OF THE DAGUERREOTYPE. T. SLATER, OPTICIAN, LONDON, with mounting flange -- 4 inches (8cm) length; another lens (2)
lacquered-brass barrel (lacks focusing pinion), the barrel engraved R. BEARD. SOLE PATENTEE OF THE DAGUERREOTYPE. T. SLATER, OPTICIAN, LONDON, with mounting flange -- 4 inches (8cm) length; another lens (2)