PHYSICAL TRAINING DEVICE Russian patent published in 1994 - IPC

FIELD: educational supplies. SUBSTANCE: device has vessel made of current-conducting material and disposed inside cavity of electromagnet-solenoid. The vessel is partially filled with ferromagnetic liquid. Cap of the vessel is made of dielectric material. Current-conducting rod is mounted in guides of the cap. The rod is provided with opposing spring with button and dielectric tip, which interacts with liquid. Device also has signaler connected in series with current source through the switch, rod and case of the vessel. Changes in state of aggregation of matter of ferromagnetic liquid may be shown under effect of magnetic field. EFFECT: improved efficiency. 1 dwg