Bell in Vacuum Experiment for Sound Wave Demonstrations Item Type_Spoon Sprung-tip jockey contact slides smoothly

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

and a sprung jockey for null-point sliding contact

teaching electromagnetism

Borosilicate 3

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

Bell in Vacuum Experiment for Sound Wave Demonstrations Item Type_Spoon Sprung-tip jockey contact slides smoothlyIllustrates 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.