Triumphs and wonders of the 19th century, the true mirror of a phenomenal era, a volume of original, entertaining and instructive historic and descriptive writings, showing the many and marvellous achievements which distinguish an hundred years of material, intellectual, social and moral progress .. . prevent acurrent passing through them, and the galvanometer remained when an electric spark was emitted near the tube, the resistance was so WONDERS OF ELECTRICITY 31 much decreased that the current passed readily through the filings, and wasdetected by the galvanometer. This is si
Triumphs and wonders of the 19th century, the true mirror of a phenomenal era, a volume of original, entertaining and instructive historic and descriptive writings, showing the many and marvellous achievements which distinguish an hundred years of material, intellectual, social and moral progress .. . prevent acurrent passing through them, and the galvanometer remained when an electric spark was emitted near the tube, the resistance was so WONDERS OF ELECTRICITY 31 much decreased that the current passed readily through the filings, and wasdetected by the galvanometer. This is simply equivalent to saying that thedischarge of the electric spark made the filings to cohere and become a betterconductor than when lying loosely in the tube. Here, then, was opportunityfor an instrument which had but to regulate the number of sparks and indi-cate the presence of the electric waves in order to produce dots and dashessimilar to those used in the common telegraph. Such an instrument wasbrought nearest to perfection by Signor Marconi, a young Italian, in it he succeeded in sending electric waves through ether or space, andwithout the use of wires, a distance of four miles, upon Salisbury Plain, Eng-land. Later, he transmitted messages by means of space (wireless) tele-. THE GREAT EASTERN LAYING AN OCEAN CABLE. graphy across Bristol Channel, a distance of miles, and subsequentlyacross the English Channel, a distance of 18 miles. Mr. W. J. Clarke, ofAmerica, has improved upon Marconis methods of space telegraphy, andshown some remarkable results. Whether space telegraphy will eventuallysupersede that by wires is one of the problems that time only can such are the possibilities of electrical science that we may well be pre-pared for more wonderful revelations than any yet made. iv. hello! hello!Telegraph (Gr. tele, far, and graphein, to write) implies the production ofwriting at a distance by means of an electric current upon a
Size: 1756px × 1423px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookidtri, booksubjectinventions
