Electric Field Shape Demonstration Apparatus Lab Equipment and Supplies_Lab Equipment Four-point-five-ohm 9A standard rheostat with

Four-point-five-ohm 9A standard rheostat with constantan winding on a vitreous-enameled steel tube

and a 60cm multicolored scale on a hollow wooden resonance box let students vary length and tension to test the physics of vibrating strings

Square-section aluminum tube 1 meter long with side graduations and four sliding riders

supplying the imperial-length counterpart to the 300mm metric lead for inch-scaled bench setups

the workhorse high-impedance unit for low-current voltage-divider and signal-conditioning work

Electric Field Shape Demonstration Apparatus Lab Equipment and Supplies_Lab Equipment Four-point-five-ohm 9A standard rheostat withDesigned to make electric field lines visible, this apparatus aligns suspended particles in a liquid medium between charged electrodes to reveal dipole and parallel plate field shapes.