Reference: S7
Category: Sound
Purpose:
Description: 1) Galton's Whistle. Blow by means of rubber tube connected to gas tap.
2) Sensitive flame: turn yup gas pressure until flame is just about to flare.
3) Refraction of sound. Hold balloon filled with CO2 between whistle and sensitive flame.
4) Sensitive flame also responds to jingle of keys and the letter "S"
