Howstuffworks "Signaling - Encyclopedia Entries"

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Featured Signaling Entry

Siren

Siren is a device used to sound warning signals. Ambulances, fire engines, and police cars use sirens to alert traffic. Sirens called foghorns are used on lighthouses and ships to warn other ships away during foggy and other bad weather. Sirens are also used for air-raid warnings. More »

THE SIGNALING LIBRARY

Heliograph

Heliograph, HEE lee uh graf, was an instrument used to send signals by reflecting sunlight with a... More >>

Megaphone

Megaphone, MEHG uh fohn, is a hollow, cone-shaped device used to make a voice sound louder. A... More >>

Semaphore

Semaphore, SEHM uh fawr, is a method of signaling with targets or flags. Each flag position has a... More >>

Signaling

Signaling is one way of passing information from one person or place to another. Signals are used... More >>

Siren

Siren is a device used to sound warning signals. Ambulances, fire engines, and police cars use... More >>

Whistle

Whistle is a device that makes a sound when air or steam is forced through it. Most whistles... More >>

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