WIRELESS INVENTION.

Northern Advocate, 22 October 1920, Page 3

WIRELESS INVENTION.

END OF "EAVESDROPPING."

Successful demonstrations of a new wireless invention which marks a step towards the secrecy of wireless telephone and telegraph ' messages have Its ken place in England, and Senator Marconi lias conducted further tests fit sea in Ms yacht Elettra with a view to its wider application.

Details of the invention are secret, but it may be stated that an apparatus has been devisee! which ,by v r hat experts call an '' electrical method of concentration," propagates tho eketric waves in a "beam" in u*iy desired direction, and in that direction

only.

Hitherto the electric waves sent out from wireless stations have spread out in all directions and all who " listenedin" could hear. The new invention will mark the end of the wireless "eavesdropper." When it is perfected a wireless station will be able to send out Morse or spoken meseagos which will, be heard only by those for whom they are intended.

The new apparatus, which is bemg worked at an experimental station in England with a short-wave length, has recently been demonstrated to a number of experts, who expressed the greatest interest in the discovery. -

It is known that German wireless research has been lately closely directed to this problem of the " oavesdropper," for the Germans realised that we were able to pick up with our listening sets much valuable information about Zeppelin movements during

the war.