Bell in Vacuum Jar, Acrylic, 4-6V DC Pack Size_100 Metal spouting cylinder with multiple

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

packaged in a wooden storage box

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

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 Metal spouting cylinder with multipleAcrylic 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.