Sound No. 243
January 1961

This unit includes:

a short length of black nylon string
a whistle (bottom view, side view at left)
a flexible reed (top view at left)
a siren (top view at left)
a white plastic sheet (for a drum head)
a plastic vial (not shown)
a harmonica (top view at left)
a 12-page booklet containing 24 experiments