Breckland Scientific 2023 Catalogue

Sound & StandingWaves

Sound

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Related Products... See also PUMPS 1 PUMP PLATE For use in the classic ‘Bell in Vacuum’ experiment. This high quality unit has a sealing ring, is mounted on a tripod, has a hose connection on the pump-side, and a ventilation port. Includes two-pole current feed via 4-mm safety sockets, a cable of approximately 1m length with 4mm safety plugs, plus a central bore with M12 thread for attaching experimental equip- ment. • Size: 250mm (Dia.) x 90mm (H) • Electrical limit specs.: max. 48v, max. 12A • Vacuum connection: 2 hose nozzles 12mm and 8mm dia. Cat No. Description Price Per SWA-620-100 Pump Plate 226.82 ea. 2 BELL JARS A range of borosilicate glass bell jars, each with a flat, ground glass flange at the base to form a better seal against a vacuum plate or similar. Socket (for a stopper to fit) or knob top versions are available. Cat No. Height Diameter Type Price Per BEL-050-100 200mm 150mm Socket Top 29/32 79.98 ea. BEL-050-150 250mm 150mm Socket Top 29/33 99.98 ea. BEL-050-200 300mm 200mm Socket Top 29/34 149.90 ea. 3 BELL IN A BELL JAR APPARATUS An acrylic bell jar, complete with pump plate, for carrying out the classic bell-in-a-jar experiment to show that sounds waves require a medium in order to be transmitted. The pump plate is connected to a vacuum pump (not supplied) to remove the air from the bell jar, creating a vacuum. The top of the bell jar has a stopper with two metal rods to act as terminals for the electric bell (included). Cat No. Description Price Per SWA-625-100 Bell Jar Apparatus 97.60 ea. 4 LASCELLS SPACE TUBE A modern replacement for the Bell in a Bell Jar Apparatus, to demonstrate that sound waves do not travel through a vacuum. A 90mm diameter acrylic tube houses a battery-operated, high output piezo sounder. When the end plates are attached and the unit evacuated using a vacuum pump, no sound can be heard; but the sound returns when the air is allowed back in. An effective demonstration with none of the complications of the traditional apparatus. Overall length 150mm. Requires a vacuum pump. Cat No. Description Price Per SWA-635-110 Space Tube 53.33 ea. 5 DOPPLER SWING Swing it in a full circular motion and your students will experience the doppler effect first hand. Uses 2 x AA batteries (not included). Cat No. Description Price Per SWA-055-100 Doppler Swing 33.94 pr BAT-100-200 AA Batteries 2.29 4pk 6 LASCELLS DOPPLER BALL The Doppler Ball is a 90mm plastic ball with a PP3 battery powered tone generator and speaker inside. The ball can be safely whirled round in a large horizontal circle to demonstrate the Doppler effect. Good output volume and variable pitch provide all that is required for an effective demonstration of the Doppler shift associated with a moving source. PP3 battery and rotation cord supplied. Cat No. Description Price Per SWA-045-200 Doppler Ball 64.25 ea.

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Pump Plate

Bell Jar

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Lascells Space Tube

Bell in a Bell Jar Apparatus

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Doppler Swing

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Doppler Ball

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