The Bell and Vacuum Sound Jar is used to demonstrate the principle that sound does not travel in vacuum. This is a modified unit which does not require external power source for the bell.
The set comes complete with acrylic Bell Jar, Alarm Bell - which requires 2 D batteries - (not included), and a Vacuum Pump Plate. Assembled unit is 7.5 in. (190mm) x 11 in. (280mm) Diameter x Height.
Perfect for isolating experiments from outside interference or studying the Properties of Matter in a Vacuum. This Bell jar is for use in only in this sound experiment application and is not intended
to be used with high vacuum systems or other applications. It can withstand the small amounts of Vacuum to produce the effects in this experiment. It has not been tested at a full vacuum. How much
Vacuum will it stand? we do not know. We are not liable for any other use other than what it is intended for.