The need to communicate rapidly over long distances reached critical proportions once the Western world became heavily industrialized and urbanized. Visual telegraphy systems such as the semaphore had insuperable physical and speed limitations....

The electrical telegraph is a telegraph that uses electric signals. The electromagnetic telegraph is a device for transmission of written messages without physical transport of letters over...

Today is Monday, April 2, the 92nd day of 2007. There are 273 days left in the year. The Jewish holiday Passover begins at sunset.Today's Highlight in History:On April 2, 1917, President Wilson asked Congress to declare war against Germany, saying, "The world must be...