THE WORLD'S ADVANCE 



255 



The tuned buzzer 



-"" tester 



Arrangement of the Different Pieces of Apparatus, as Well as the Wiring Scheme for a Direction Finder 



Receiving Set. 



masts, a ship operating the direction 

 finder is required to have two closed cir- 

 cuit loops in the form of triangles of 

 equal size, suspended vertically and 

 crossing each other at right angles. 

 These are usually suspended from a fore 

 and aft stay, or from a sprit, gaff or 

 bracket on one of the masts. Connec- 

 tion to the instruments is made from the 



centers of the horizontal base wires, this 

 distance being kept as short as practicable 

 and governed largely by the wave length 

 of the wireless apparatus. The wires 

 lead directly into the radio-goniometer 

 case and the received electric energy 

 flows through two excitation coils, setting 

 up a magnetic field which acts upon a 

 third coil known as the exploring coil. 



