How do the All-Weather Safety whistles make so much noise?
About a hundred years ago a professor of physics named Hemholtz devised a box that would take sound waves. Depending on the size of the box, it would either muffle the noise or increase the sound. This is like throwing a tennis ball in a room. If the room is very large the tennis ball will simply roll to a stop. If the room is very very small the tennis ball will be stifled and not go anywhere but if the room is just the right size the tennis ball will bounce off the walls and rebound all over the place. Helmholtz found that a box with a noise maker inside would either increase the sound waves or decrease them. This principle of sound augmentation and amplification was never applied to whistles or alarms until Dr. Howard Wright invented the Storm Whistles in 1988.
