Instruction Manual

Elwe Didactic GmbH • Steinfelsstr. 6 • 08248 Klingenthal • Germany • www.elwedidactic.com

3B Scientific GmbH • Rudorffweg 8 • 21031 Hamburg • Germany • www.3bscientific.com

Subject to technical amendments.

4. Sample experiment

4.1 Propagation of sound waves in air

In order to conduct this experiment, the following

apparatus is additionally required.

1 Vacuum cylinder U8421230

1 Base plate U8421225

1 Electric doorbell U21854

1 AC/DC Power Supply U33030

Experiment leads

5. Maintenance

Make sure that the sealing rings are always prop-

erly lubricated. To do so, carry out the following

steps:

• Unscrew the lid and remove it along with the

piston. If necessary, clean and lubricate these

components.

• While reassembling, insert the piston properly.

Make sure that the components are assembled

to fit perfectly before screwing them on (also

see the instructions printed on the pump).