Lot Essay
Negretti & Zambra were working from 1850.
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Details
Stereo-graphoscope
Rowsell's patent, England; wood-body, hinged 6-inch diameter magnifying lens, hinged stereograph holder, a pair of viewing lenses, inset roundel ROWSELL'S GRAPHOSCOPE. PATENT and retailer's label NEGRETTI & ZAMBRA, LONDON. OPTICIANS AND INSTRUMENT MAKERS TO THE QUEEN
Rowsell's patent, England; wood-body, hinged 6-inch diameter magnifying lens, hinged stereograph holder, a pair of viewing lenses, inset roundel ROWSELL'S GRAPHOSCOPE. PATENT and retailer's label NEGRETTI & ZAMBRA, LONDON. OPTICIANS AND INSTRUMENT MAKERS TO THE QUEEN