The Harmonic Synthesizer is an the lobby of the McLennan physics building, University of Toronto.
Here’s the description from the accompanying card:
This marvelous machine was used to dress the output of the large fork and resonator with a controlled set of overtones. Each fork is mounted in front of the appropriate resonator and driven by coils connected in series using the electronome interrupter tuned to the fundamental. A small keyboard opens the resonators.
It appears that the componenets of this apparatus have been redeployed, as the present set-up does not agree with the illustration in the 1889 catalogue and several pieces have been mounted with screws through the maker’s ark – an unlikely occurrence in the original mounting. This was probably done to allow operation of the keyboard from the back.
No word on how this would sound. If you know anything more about this Harmonic Synthesizer, leave a comment!