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Nineteenth century Zograscope,
The zograscope was popular from the mid 18th century through to the mid 19th century. The large viewing lens allowed both eyes to be used when viewing the print, this helped give an illusion of depth to the print. The angled mirror allows the print, known as a perspective view or vue d'optique, to be laid on a table behind the viewer. Prints intended for the zograscope generally show architectural subjects with strong perspective, lettering on the print is mostly laterally reversed.
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Mid 19th century tabletop device, made of turned wood with brass fittings, viewing lens and angled mirror. During the 18th century these devices were commonly known as ‘optical diagonal machines’