Single-Phase Rheostat, 10Ω, 200 x 56mm Graduations_Ungraduated closing the circuit only while

closing the circuit only while the button is held to introduce momentary-contact behavior alongside latched switches

5-cm closed ring on this plated mild steel retort accessory

Tangent-galvanometer instrument that derives current absolutely from compass-needle deflection against Earth's horizontal field

conductor length

Red-coated Alnico cylindrical pair at 50 x 10mm

Single-Phase Rheostat, 10Ω, 200 x 56mm Graduations_Ungraduated closing the circuit only whileCover protected 10 ohm 4A single rheostat with constantan winding on a 200x56mm tube and 4mm safety socket terminals, supplying enclosed wiper variable resistance for student safety.