| Show emery cloth to clean your rheostat contacts orating and sizzling noises heard in tile the louil loud speaker or phones tire ore sometimes due to a defective rheostat contact remember that there are two sliding gliding contacts in every wire wound rheostat there Is one between the contact finger tin and the resistance wire and the other Is between tile the rotating shaft tin and tile the spring which Is connected to the lie terminal it Is easy enough to test the pressure of tile lie contact on the resistance wire but the other sliding contact may have acco become me weak or dirty the rhe remedy for this condition in most fornis forms of rheo rheostats Is to take li apart and increase the tension bif i tile the spring after cleaning the tha coutin tout t surri tees es with einera cloth |