Grandest century in the world's history; containing a full and graphic account of the marvelous achievements of one hundred years, including great battles and conquests; the rise and fall of nations; wonderful growth and progress of the United States ..etc., etc . b its lines of force. If these fluctu-ating lines of force, therefore, are crossedby rings of wire, currents of electricitywill be generated in the wire. And soit is every time one speaks into a tele-phone, for electricity is generated andsent along the wire to the other end, ina direction which varies with the in-and-out action of t
Grandest century in the world's history; containing a full and graphic account of the marvelous achievements of one hundred years, including great battles and conquests; the rise and fall of nations; wonderful growth and progress of the United States ..etc., etc . b its lines of force. If these fluctu-ating lines of force, therefore, are crossedby rings of wire, currents of electricitywill be generated in the wire. And soit is every time one speaks into a tele-phone, for electricity is generated andsent along the wire to the other end, ina direction which varies with the in-and-out action of the telephone. You will clearly see, then, that elec-tricity is produced at the trcu?s?nitting 456 MARVELLOUS INVENTIONS AND DISCOVERIES. end. What happens where the listenerhas his attentive ear to the telephone ?The electricity travels round the coilof the receiving telephone, and variesthe magnetism of the bar within it,which in its turn varies its attractionupon the ferrotype plate beginning to ductor, a telegraphic wire, with elec-tricity for the driving force, is the besttransmitter ever discovered. The tele-phone has rapidly sprung into use, andhas become a necessity in our largetowns, where, on account of the pres-sure of business, time is money and. COMMUNICATING BY TELEPHONE. vibrate, and it vibrates in such a way asto reproduce the sounds which werespoken into the transmitting end. That we should ever be able to talkby lightning was not dreamed of formany years after the discovery of thetelegraph proved that messages couldbe transmitted through motions of theelectric instrument producing we do not have to write the com-munication, but can speak to a personmany miles away, and converse almostas freely as we would with one by ourside in the same room. The principle is that of the transmis-sion of sound. The air, the water,woods, metals are all conductors, but ithas been proved that a metallic con- moments count for as much as hoursdid once. A man of business c
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