autotransformer dimmer

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Leonardo da Vinci (1452-1519), Italian Renaissance painter from Florence. Engraving by Cosomo Colombini (d. 1812) after a Leonardo self portrait. Ca. 1500.

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Mayer Amschel Rothschild (1744-1855), founder of the house of Rothschild; lithograph by Friedrich Lieder, c. 1830.

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autotransformer dimmer

electronics

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stage design and lighting control

In stagecraft: Dimmers
The autotransformer dimmer controls current flow by varying the voltage in the circuit. It was rarely used to control stage lights, but at the turn of the 21st century it was still being used in some theatres to control house lights.
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