418 



0. A. Chant— Reception of Electric Waves. 



diameter, ending in a knob 9'5 mm in diameter, the length over 

 all being 1 meter. The spark-length was 2'8 mm in air, and the 

 knobs were kept polished for good effects. 



First, the length of wire required for resonance with the 

 oscillator was found as explained in section 2. The experimental 



disposition is shown in diagram I of figure 8, distance d being 1 

 meter, and curve I shows the result. Resonance was ^ well- 

 marked, attaining a maximum with a length 204 cms . This is evi- 

 dently the half-wave-length of the oscillator. Then the wire AB 

 was made in succession 204 cms and 102 cms long, and at a distance, 

 d, of 1 meter, was explored when exposed to the action of the 

 oscillator. In each case there was a well-marked fundamental. 



