1907.] on Recent Gontrihntions to Elpctric Wave Telegmjihy. 101 



then Marconi armn^-es a number of horizontal receivin": antennpe hke 

 the spokes of a wheel, all having a common shorter part vertical as 



their centre (see Fig. 21). In the vertical part a magnetic detector 

 is inserted, and by means of a switch any one of the horizontal radial 



Mi^ 



Fig. 21. — Marconi Localising Antenna. 



antennae can be put in connection with it. By finding which radial 

 gives the strongest signals, the direction of the sending station is 



2 z 2 



