Large, upright wooden frame with cross beams at side. Two vertical poles / tubes at each side divided into four sections with acetate discs. Paper reels (cut to represent pitch) are fed through a series of metal poles - a roller runs along top (cut) edge of paper to sense the pitch , each vertical section and a sine wave oscillator. Three oscillators had the fundamental frequency marked on masking tape.
Paper, softwood, cardboard tubes, wire, electronics, 260 x 214 x 83cm