For demonstrates of phenomena related to electromagnetism and electromagnetic induction, such as polarity of electromagnets, magnetic lines of forces, self and mutual induction, principle of transformer, relationship between direction of magnetic lines of force and direction, of flow of electric current in a coil, effect of introducing core on electromagnetism, etc. Kit consists of a pair of coils wound on saddle-shaped, plastic bobbins with connection terminals; one each round and rectangular iron bar; pair of semicircular iron strips; one U-shaped iron core; four differently colored connecting leads with crocodile clips; iron fillings; and one cord with a rectangular window. With instruction.