This induction coil is housed in a wooden box and looks to be a more modern version. Mid 20th century. An induction coil would have been used to create sparks for various scenarios such as;
Radio & Telegraphy:Created sparks for early wireless telegraphy and radio signal transmission.
Medical Electrotherapy:Used in Victorian/Edwardian "quack" cures for various ailments, often called shocking coils or violet ray devices.
X-Ray Machines:Powered early Crookes tubes for diagnostic X-rays.
Arc Lighting:Provided power for early arc lamps.
Scientific Demonstration:Popular for experiments, lighting Geissler tubes, and showing electrical phenomena in education.
Automotive Ignition:A simplified form became the ignition coil in early internal combustion engines.