Ancien rhéostat à curseurs , Machine à bobiner ancienne - Telegraphy Type Reel to reel audio

Old sliding rheostat, a laboratory electrical instrument designed for the progressive adjustment of resistance and current in a circuit. The device consists of a substantial wound cylinder mounted between two wooden supports, with two metal rails and sliding contacts allowing selection of different portions of the winding. A fine old construction combining wood, metal, and resistive material, typical of scientific and educational equipment used for electricity and electrodynamics experiments. The set shows significant patina and signs of use in keeping with its age. A beautiful collectible for enthusiasts of scientific instruments, laboratory equipment, old physics, and industrial heritage. 1900–1930.