Demonstration Device of an Alarm from a Clock Under a Bell
Product Code : JL-GLE-11265
The Demonstration Device of an Alarm from a Clock Under a Bell, SKU JL-GLE-11265, is a JaincoLab bell jar sound apparatus. The electric bell is placed in the glass cage, which is closed with a rubber plug carrying two sockets. When the vacuum pump removes air through the glass tube, the sound of the bell dies away while it can still be seen working; letting air back in brings the sound back, showing that sound travels through a medium but not through a vacuum.
Specifications
Parts supplied according to the listing:
| Product | Demonstration Device of an Alarm from a Clock Under a Bell |
| SKU | JL-GLE-11265 |
| Cat. No. | JSS-221/041 |
| Glass cage | 1 |
| Electric bell | 1 |
| Rubber plug | With two sockets |
| Glass tube | 1 |
| Electric power source | 1 |
| Connecting leads | 1 m black; 1 m red |
| Vacuum pump | 1 |
Sound and vacuum demonstration
What the class observes:
- The ringing becomes fainter as the pump removes air
- The bell can still be seen working when little sound is heard
- Sound returns when air is let back into the cage
Scope of supply and ordering
Supplied with the cage, bell, plug, tube, power source, both leads and the vacuum pump; the listing gives no sizes for the glass cage or tube, so these, the pump specification and order quantities are given on the quotation.
Frequently asked questions
Does the set include a vacuum pump?
Yes, a vacuum pump is part of the listing.
How many sockets does the rubber plug have?
Two.
What leads are supplied?
A 1 m black conductor and a 1 m red connecting wire.
What principle does it demonstrate?
Sound needs a material medium and cannot pass through a vacuum.
Related products
Sound experiments are covered by the JaincoLab general lab equipment range.
Request a quote
Request a quotation for the bell jar sound apparatus (JL-GLE-11265) through the contact page. Tender and project enquiries can be sent through the tenders page.
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