Adherence, Electro-magnetic

The adherence between surfaces of iron due to elcctro-magnetic attraction. It has been applied to the driving-wheels of an engine and rail, whose grip is increased by such action. In one method a deep groove was cut around the wheel which was wound with a magnetizing coil. Thus one rim becomes a north and the other a south pole, and the rail completing the circuit acts as the armature. Such an arrangement prevents a wheel from sliding. Electro-magnetic adherence has also been employed to drive friction gear wheels. In one arrangement the two wheels are surrounded by a magnetizing coil, under whose induction each attracts the other, developing high adherence between their peripheries. 12  STANDARD ELECTRICAL DICTIONARY. IMG:8956969607833025625_012F3.JPG: Fig. 3. ELECTRO-MAGNETIC CAR WHEEL. IMG:8956969607833025625_012F4.JPG: Fig. 4. ELECTRO-MAGNETIC FRICTION GEAR.