Show THE MARCONI SYSTEM how wireless telegraph messages aro and in view of alic chaim made by mar coni to the effect that lie had received i a signal at st johns newfoundland from the lizard cornwall 1800 miles I 1 away by ancans incans of his clesi heleg 1 raphy system a brief account of h methods of transmitting and ing jirele messaged is timely in the marconi system of wireless telegraphy the sending apparatus consists of a mast carrying a wire alic wire is carefully insulated by suspension clear of contact and it is aft disconnected electrically at the top the of alio mast and consequently the length of alio wire varies with the distance to which transmission is desired and tho distance increases with the height an ordinary signaling mast is about feet hiigli alic lower end of the insulated wire is connected to a powerful spark coil and when a mesa age is sent powerful sparks are drawn from the electrical generator under alio control of a hand key operated in the same way as an ordinary morse wire telegraph these powerful sparks producing to alie rhythm of the dots and dashes simultaneously electrify alo vertical wire supported by the mast and cause tho emission from it of a corresponding sequence of invisible electric waves these waves radiate out over the surrounding land or sea in all directions with enormous velocity and wherever in their advance they strike a similar vertical wire they produce in it a electric disturbance which can bo made manifest by a suitable apparatus pa ratus the receiving instrument is connected to the receiving vertical wire at any position in distance within the range of transmission the principal part of alio receiving apparatus is the it consists essentially of a small glass tube wires entering from both ends a email gap between the wires inside this gap is filled with metallic filings which have the property of opposing a flow of electricity in the normal condition of alic filings on the passage of an electric wave however through alie the filings are brought into better contact electrically welded and they can allow an electric curr current to pass by a suitable device the bilings are then shaken apart the practical result being that the dots and dashes come out just as they were transmitted and are so recorded when messages are being sent the is disconnected it is only used for receiving about forty ships in the british navy have so far been equipped with this apparatus and the range of signaling ii about sixty miles alie longest d stance yet covered willi a message by tho marconi system previous to that claimed last saturday has been from st catherines on the islo of to the lizard cornwall a distance of miles electricians generally seem to regard saturdays performance skeptically ti dr A E kennelly in speaking of the matter yesterday said that with most of the philadelphia PhiL idelphia electr ceans he considered the reports so far published about the alleged wireless signal sent across 1800 mile of ocean from cornwall to newfoundland as too indefinite to warrant any trustworthy conclusions and eliat not until an actual message had been transmitter io I o tween tho two points will it be to say eliat the hitherto existing ice ord of miles has been inc reis d to 1800 but he thought it quite reasonable to expect that oscr miles would be possible at some future time even supposing alie present results to bo premature |