Bell in Vacuum Experiment for Sound Wave Demonstrations Item Type_Spoon running on mains or battery

running on mains or battery with a 15 by 17 cm pan for routine weighing in classrooms and stockrooms

Compact 42-cm resistance investigation board

Sprung-tip jockey contact slides smoothly along the resistance wire of a Wheatstone bridge or potentiometer to find the null-deflection balance point during student-built bridge experiments

Packaged as a matched Euro-design pair of polypropylene measuring jugs

Bell in Vacuum Experiment for Sound Wave Demonstrations Item Type_Spoon running on mains or batteryIllustrates that sound needs a medium to travel through a 10 inch acrylic bell jar with internal buzzer, rubber stopper, and lead plugs for pump plate connection during evacuation.