Bell in Vacuum Jar, Acrylic, 4-6V DC Pack Size_100 Acrylic bell-in-vacuum jar with an

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

demonstrating mechanical-to-electrical energy conversion as the crank lights the bulb

packaged in a wooden storage box

Metal spouting cylinder with multiple outlet holes at different heights

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

Bell in Vacuum Jar, Acrylic, 4-6V DC Pack Size_100 Acrylic bell-in-vacuum jar with anAcrylic 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.