Standard Rheostat, Model B Material_Polypropylene and field magnet for direct

and field magnet for direct observation as students trace how current produces rotation in a closed magnetic circuit

Tirrill burner on a stable octagonal base adds air

transmitting maximum light when their axes align and nearly extinguishing it when crossed at 90 degrees

three interchangeable scales

the lower-resistance higher-current option in the compact-tube rheostat line

Standard Rheostat, Model B Material_Polypropylene and field magnet for directStandard rheostat with oxidized constantan winding on a vitreous enameled steel tube and a heavy duty sliding contact, supplied with three binding posts for rheostat or potentiometer wiring.