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Radio Antenna, Home Alarm System, Hair Dryer
The first radio transmission is commonly credited to Italian Guglielmo Marconi in 1895. Radio made an immediate impact on ships at sea, and in those early days, radio was used like a telephone. Using radios, captains relayed positions, transmitted messages and sent out distress calls. By the 1920s, the idea of broadcasting to the masses caught on. Next, the earliest burglar alarms were simple devices that required little more than gravity to work. With the advent of electricity, the mechanical possibilities for alarms soared. Electric contacts used a magnet to complete an electrical connection at a door or window. Contacts today are more refined but still work on this same basic principle. Then, hair dryers went through decades of innovation before they really caught on with the public. By the '50s they had become small enough to hold in your hand, and quiet enough not to be a nuisance. Their popularity heated up a revolution in hot-air hairstyles that has continued for more than years.

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