a set of lecturing magic lantern slides, circa 1932, a series of 51 standard 3.1/4 square glass slides, detailing in sequence, as an aid to audio lecture, the process, history and current use of the Televisor, with diagrams, photographs and silhouettes, most with captions, in three-division black painted crate with loop catches, stencilled inside from the Baird company - 9in. (23cm) wide
a set of lecturing magic lantern slides, circa 1932, a series of 51 standard 3.1/4 square glass slides, detailing in sequence, as an aid to audio lecture, the process, history and current use of the Televisor, with diagrams, photographs and silhouettes, most with captions, in three-division black painted crate with loop catches, stencilled inside from the Baird company - 9in. (23cm) wide
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