Autonduction

Autonduction (from Greek autos-self and Latin conductio-conductivity), a term given by d'Arsonval to phenomena occurring in the human body placed in the so-called "large solenoid," i.e., inside the winding of a high-voltage, high-frequency transformer. When any body is introduced into the alternating magnetic field of a solenoid, induced closed currents, so-called Foucault currents, are formed in this body. Similar currents that arise in the iron cores of induction instruments, acting as internal, short-circuited, secondary windings of these devices, are parasitic currents. They absorb a significant portion of the energy of the primary magnetic flux, converting it into heat that heats the core. In the human body placed in a solenoid, the same Foucault currents exist, which in this case produce the desired thermal effect in the organism.