German, c.1900, signed 'Max Kohl, Chemnitz, D. R. G. M. No.189710', constructed of lacquered brass with engraved graduated geared wheel to front, with cam and follower adjusting piston
Note: German psychologist William Stern invented the tone variator in 1897 to study human sensitivity to changes in pitch. German, c.1900, signed 'Max Kohl, Chemnitz, D. R. G. M. No.189710', constructed of lacquered brass with engraved graduated geared wheel to front, with cam and follower adjusting piston
Sold for £719
Result plus buyers premium
German, c.1900, signed 'Max Kohl, Chemnitz, D. R. G. M. No.189710', constructed of lacquered brass with engraved graduated geared wheel to front, with cam and follower adjusting piston
Note: German psychologist William Stern invented the tone variator in 1897 to study human sensitivity to changes in pitch. German, c.1900, signed 'Max Kohl, Chemnitz, D. R. G. M. No.189710', constructed of lacquered brass with engraved graduated geared wheel to front, with cam and follower adjusting piston
Auction: Fine Photographica & Instruments of Science, 19th Nov, 2020
Viewing Location:
8 Rivermead
Pipers Way
THATCHAM
RG19 4EP
Important Information: Non-Attended Sale On-Line, Telephone & Commission Bids Only
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Viewing by appointment from 1st November 2020
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