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The bowed clavier (Bogenclavier,streichklavier or geigenwerke in German) is a keyboard instrument strung with gut strings, the tone of which is produced by a steadily revolving, well rosined cylinder powered by a foot pedal, a mechanism similar to that found in the hurdy-gurdy
The Geigenwerck was illustrated and described by Michael Praetorius in his treatise on musical instruments Syntagma Musicum II, in the section De Organograhia, published 1614-20 in Germany.
It was re-invented by Joh. Hohlfeld of Berlin in 1751. This instrument and another one of his inventions, a device that recorded keyboard improvisations in real time, were mentioned in the "Essay on the True Art of Playing Keyboard Instruments" by C. P. E. Bach.
References
Bowed clavier Wikipedia(Text) CC BY-SA