

Other effects, such as stagehands wiggling beneath a piece of floor-cloth to simulate water, would simply not work on radio. A thunder sheet, which was a large, thin sheet of copper suspended from a frame by wires, sounded genuinely like thunder when moved.

In the late twenties, radio turned to theater for its early, primitive effects, some of which worked well. In the beginning, a sound effect on radio might be as simple as a door closing or a telephone ringing. Early references to sound in radio scripts called for the actors to allude to a sound with dialogue such as, "'I wonder why that car is stopping in front of our house?' To which audiences throughout America would ask each other, 'What car? I didn't hear a car.

Script writers knew this but were not sure at first how to handle the problem. A dramatic pause on radio was nothing but dead air listeners might even presume they had lost reception. Writing for stage, vaudeville, and film did not translate directly to radio.
