Bell in Vacuum Jar, Acrylic, 4-6V DC Pack Size_100 varying length isolating density as

varying length isolating density as the single variable across materials

packaged in a wooden storage box

Die-cast body with plated brass parts anchors this cork-lined two-prong universal clamp

this concave glass mirror at 100mm focal length runs at f/1 for vivid real-image demos and converging-reflection work

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

Bell in Vacuum Jar, Acrylic, 4-6V DC Pack Size_100 varying length isolating density asAcrylic bell in vacuum jar with an internal 4 6V DC electric bell that fades and falls silent as the enclosed air is removed, visualizing sound transmission dependence on a medium.