One-Meter Two-Wire Potentiometer on Metal Base Lab Equipment and Supplies_Lab Supplies and 4-pole armature configurations on

and 4-pole armature configurations on the same motor frame by swapping interchangeable enameled-copper armatures past a permanent bar magnet on a disc commutator

and Kirchhoff's-law combinations

with a keeper bar bridging the poles in storage

Single-pole double-throw switch on a demonstration base

plastic body with sturdy metal rod

One-Meter Two-Wire Potentiometer on Metal Base Lab Equipment and Supplies_Lab Supplies and 4-pole armature configurations onUsed to compare EMFs and measure internal resistance by the null deflection method, this two wire potentiometer mounts on a metal base for stability during extended laboratory measurements.