Wool Cloth for Electrostatic Charging Material_Hardwood and a 60cm multicolored scale

and a 60cm multicolored scale on a hollow wooden resonance box let students vary length and tension to test the physics of vibrating strings

Spanning C (256 Hz) through C (512 Hz) in scientific pitch

Acrylic bell-in-vacuum jar with an internal 4-6V DC electric bell that fades and falls silent as the enclosed air is removed

5mm copper wire on a 5 x 4

sized for high-turn-count windings where each turn adds little diameter to the coil core

Wool Cloth for Electrostatic Charging Material_Hardwood and a 60cm multicolored scaleUsed to generate triboelectric static charge by rubbing against glass, rubber, or acrylic rods, this wool cloth is a standard accessory for electroscope and Van de Graaff work.