Springboard (a home constructed musical Instrument) monochord with inline springs made by electro-acoustic musician Hugh Davies (1943-2005) Springboard monochord musical instrument
Springboard (a home constructed musical Instrument) with one wider and two narrower springs made by electro-acoustic musician Hugh Davies (1943-2005) Springboard musical instrument
Springboard (a home constructed musical Instrument) with web arrangement of springs made by electro-acoustic musician Hugh Davies (1943-2005) Springboard musical instrument
Two symphoniums invented by Sir Charles Wheatstone, in leather case. Wheatstone's symphonium, c 1829. 1829