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Show AN ELECTRICAL WONDER. Ingenious Contrivance Constructed In -America-Tor tiie Japanese x A wonderful electrical contrivance, an instrument used in the transmission transmis-sion of messages by means of wireless telegraphy, has recently been built by a Philadelphia firm for the Japanese government. The instrument is the largest coil ever constructed for transmitting trans-mitting wireless messages and one , which also gives the largest spark of any coil heretofore built. This coil will easily give a miniature streak of lightning 45 inches in length, being three inches longer than that of the famous Spottiswood coil built some years ago in England. It is now in use in flashing cableless messages between be-tween the Korean peninsula and Japan. Ja-pan. The object of the induction coil is to obtain the little flash of lightning, for it is this spark bursting through the t air that sends forth the etheric waves for hundreds of miles. In the Queen coil when the terminals are separated a distance of 42 inches a forked streak of liquid lightning bursts through the air with a cracking noise just as real lightning does. Though the machine-made machine-made lightning does not, of course, produce as great a crash, yet the little bolt would cause death if one were to get in its way just as certainly as would any bolt that ever came out of nature's electricity works, the clouds. It requires nearly one-horse power of electrical energy to operate this giant coil. The whole apparatus Is mounted on casters and weighs, complete, com-plete, about 2,000 pounds. There was used in its construction approximately approximate-ly 1,320,000 feet of copper wire. With a proper receiving apparatus a distance of 500 miles should be bridged without difficulty hy the wireless messages. |