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An archive of optical/mechanical/automated drawing machines/devices/aids
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Roulette Geometry (Spirographs)
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Northern Signal Company
1900s
1900-1950
1950-1975
Uses gears
Uses machine-held stylus
Uses mechanical linkages
Illustrates mathematical principles
Made as a toy
From a set of instructions
From Garcia collection
Hoot-Nanny No. 2
Northern Signal Company (Flo-Tronics)
Circa 1950
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