WIRELESS TELEGRAPHY.

Poverty Bay Herald, Volume XXVI, Issue 8417, 17 January 1899, Page 4

WIRELESS TELEGRAPHY.

Recent experiments in wireless telegraphy were referred to a few days ago in the course of an interview at Adelaide by Mr F. E. Joseph, formerly of Sydney, but of late years a resident in London, who is at present on a visit to Australia. Mr Joseph, who has taken a deep interest in Signor Marconi's system, said :— " Wireless telegraphy is the most exciting development in the electrical world, and the shares in Signor Marconi's company, the Wireless Telegraph and Signal Company, started at a good premium. Their station at Poole is the centre of attraction just now for scientific men of all nations, who are able to send their messages to Alum Bay, in the Isle of Wight— a few miles away— -and receive their replies whether ,by night or day, and either in foggy or clear weather. This is a great improvement on the heliograph, for instance. The pole at Poole is 100 ft high. The height required for distance may be- said to be 30ft of vertical wire equal one mile, 60ft of vertical wire equal four miles, 100 ft equal 18 miles, and so on proportionately. The French Government are contemplating establishing permanent communication with us between Dover and Calais, and Folkestone and Boulogne, the latter places being approximately 35 miles apart. The system is daily used by the Italian navy, who have been the first to make practical use of it. It is understood that Lloyds insist that the lightships around the coast of Great Britain shall be fitted with instruments." "How can messages be so controlled that they can be received at a desired place, and at the same time not be transmilted to other places 1" asked the interviewer, a representative of the Adelaide Advertiser. "By the use of a transmitter tuned to harmonise with the receiver at the desired place. Supposing, for example, that a fleet is installed, and that the admiral desires to invite the captain of a particular vessel to dinner, without the risk of offending the captains of the other vessels, be can use a transmitter tuned to harmonise with the receiver on that particular vessel, and thus send a private message."