... balance, tuning fork, Van De Graaff Generator, Wimshurst machine, interactive whiteboard, sensor, overhead projector, LCD projector, ... pump, Pascal ball, Magdeburg hemispheres, aneroid barometer, slinky spring, Lenz Law apparatus, cylinder conductor, calorimeter, convection tube ... , Ring and ball, linear expansion apparatus, spring scale, physical balance, slotted weight educational laboratory ...