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Speed regulating

Regulating the speed of an acoustic phonograph or gramophone is most important, and as for the reproducer and sound box (Back to Basics, part 1), the same basic principle applies on each machine. A centrifugal governor is used. They come in two, three and four weighted arrangements, which are driven with either pinion gear or worm drive. On some rare and obscure machines a wind propeller is used, but we will not go into that today. My sketch for simplicity is a two-weight governor with a gear pinion drive.
Speed regulating


governor, clock