Making and Knowing
A minimal edition of BnF Ms Fr 640 in English Translation

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Spinet playing by itself

Make an axle surrounded with wheels pierced all around in their thickness and attach feathers as for a cittern or a spinet and arrange them according to the song you want it to play, leaving a suitable distance. And, turning the axle either by yourself or by a clock spring, your invention will effect itself.

Figure at left bottom margin of folio 104v Figure