Demonstration Device of an Alarm from a Clock Under a Bell
Product Code : JL-GLE-11233
The Demonstration Device of an Alarm from a Clock Under a Bell, SKU JL-GLE-11233, is the JaincoLab bell in vacuum apparatus. An electric bell rings inside a glass cage closed by a rubber plug with two sockets. As the vacuum pump draws the air out through the glass tube, the ringing fades although the hammer can still be seen striking the gong, which shows the class that sound needs a medium such as air to travel.
Specifications
Components in the listing:
| Product | Demonstration Device of an Alarm from a Clock Under a Bell |
| SKU | JL-GLE-11233 |
| Cat. No. | JSS-345/031 |
| Enclosure | Glass cage |
| Sounder | Electric bell |
| Seal | Rubber plug with two sockets |
| Air outlet | Glass tube |
| Power | Electric power source |
| Leads | 1 m black conductor; 1 m red connecting wire |
| Pump | Vacuum pump |
What the demonstration shows
Teachers use it to show:
- That sound cannot travel through a vacuum
- That the bell grows quieter as air is removed and louder when air is let back in
- That light still crosses the vacuum, since the bell stays in view
Scope of supply and ordering
This listing includes the glass cage, bell, plug, tube, power source, leads and vacuum pump; the pump type and the quantities are settled on the quotation.
Frequently asked questions
Is a vacuum pump included?
Yes, the listing includes a vacuum pump.
How is the bell powered?
From the electric power source; the rubber plug has two sockets, and 1 m red and black leads are included.
What does the experiment show?
That sound needs a medium such as air to travel.
How long are the connecting leads?
Each is 1 m long: one black conductor and one red connecting wire.
Related products
Sound apparatus is part of the JaincoLab general lab equipment range.
Request a quote
Request a price for the bell in vacuum apparatus (JL-GLE-11233) via the contact page. Tender and project enquiries can be sent through the tenders page.
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