PIERCE. 



OSCILLATIONS OF A HERTZ OSCILLATOR. 



329 



tuned receiver they have made measurements of the wave-length pro- 

 duced by rod oscillators of various lengths between 2 and 10 cm., and 

 various diameters between 0.2 and 1.3 cm., and have obtained the 

 wave-length a linear function of the length when the ratio of diameter 

 to length is kept constant, and also the wave-length is a linear func- 

 tion of the ratio of diameter to length when the length is kept con- 

 stant. By extrapolation from their measured values they find the 

 limiting value of the ratio of the wave-length to the vibrator length, 

 as the diameter approaches zero, to be 2.24. 



Coming now to the experiments that have been made with the longer 

 oscillators, I find two measurements mentioned by Drude 13 in which 

 he obtains for a wire 1 mm. in diameter and 4 meters long the wave- 

 length 8.42 meters, and for a wire 2.5 meters long the wave-length 

 5.24. These two experiments give A = 2.10 I. 



Also there is a series of measurements by F. Conrat 14 for rectilinear 

 oscillators 2 to 6 meters long (1 mm. diameter). These measurements 

 are presented in Table I., and show the average relation X = 2.12 I. 



TABLE I. 

 Conrat's Values for Relation of X to I. 



My measurements, extending the experimental records in the direc- 

 tion of the longer waves, are given in Table II. The diameter of the 

 wire employed was 1 mm. The result obtained is that the wave-length 

 of the oscillator is 2.094 times its length. This is in good agreement 

 with the results obtained by Drude and in fair agreement with those 

 of Conrat. 



l » Ann. d. Physik, 1903, 11, 965. 



" Ibid., 1907, 22, 670. 



