Resonant Tuning Fork Pair on Pine Boxes with Mass and Mallet, 440Hz cylinder Copper-block plug key switch with

Copper-block plug key switch with two 4mm terminals and a removable plastic-guarded plug

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

Reel of 30 SWG bare copper wire totaling about 1150 feet by mass

Brass-wire conductor and seven plotting compasses on a clear base

Short-form Euro-design 500mL polypropylene measuring pitcher features molded graduations and a pour spout for autoclavable chemical-resistant workflows

Resonant Tuning Fork Pair on Pine Boxes with Mass and Mallet, 440Hz cylinder Copper-block plug key switch withUsed to demonstrate beat frequencies and sympathetic resonance, this pair of 440Hz steel forks sits on pine resonance boxes (7. 5 x 4 x 2. 5 inches) with one fork carrying an adjustable tuning mass.