Wire Transmitting Electric Waves. 



61 



In every instance the actual readings are shown. 

 Linear Oscillator (fig. 1, c). — Curves obtained with this 

 oscillator are shown in fig. 7, d, e. Curve (d) is the mean of 



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DISTANCE FROM FREE END OF WIRE IN CMS. 



two'sets of readings with five swings of the pendulum. The 

 mean of five sets, each of two swings, gave the same minima, 

 though the curve was not so good. Curve (e) is a repetition 

 of the second portion of the readings ; it is the mean of two 

 sets of five swings each. 



Here three minima are easily seen at 19, 59, and 99 cms , respec- 

 tively, from the end ; and the wave-length is thus approxi- 

 mately 80 cms . 



Spherical Doublet (fig. 1, ft). — Curves for this oscillator are 

 given in fig. 8. It was much more difficult to get consistent 

 series of readings with it. Curves (a) and (ft) are for the 10 cm 

 spheres. The half-wave-lengths deduced are, respectively, 19 

 and 19-5 cms , with a mean wave-length of 38*5 cms . Curves (c) 

 and (d) are for the 30 cm spheres. The half-wave-lengths from 

 these are 61 and 62 cms , respectively, with a mean wave-length 

 of 123 cms . 



