338 



KENNELLY-NABESHIMA— ESTABLISHING A 



Fig. 9 (Film No. 40) shows the regular transient case for thir- 

 teen half cycles on the full-length artificial line, as defined in Table 



Fig. 9. Triple Oscillogram of es, is and er for 1255 km. artificial power line 



freed at distant end. / = 6o.6'~-'. 



11., at the frequency of 60.6 -—', with the distant end free (through 

 the oscillograph at 5), and with the line switch closed at or very 

 near to an instant of zero e.m.f. The electrical connections are 

 those of Fig. 3. 



The three curves on Film No. 40, Fig. 9, are Cg, is and e,-, repre- 

 senting respectively the sending-end e.m.f., the sending-end current 

 and the receiving-end voltage. The sending-end voltage (76.y volts 

 r.m.s.) is seen to be substantially uniform throughout the seven 

 cycles. It may be observed, however, that during the first two or 

 three alterations, the maxima of impressed e.m.f. are slightly 

 higher than those at later stages. This may have been an effect of 

 throwing on the load. The same efifect could also be detected on a 

 voltmeter, when throwing the line on and ofif. In the computations 

 to be subsequently described, these deviations from uniformity in 

 Cs were taken into account. In the analysis of the oscillographic 

 record, the measured values are all referred, for convenience, to 

 those which, by simple proportion, would be obtained with 100 volts 

 impressed e.m.f. 



The is curve starts, without appreciable splash, practically in 

 phase with the e.m.f. Near the end of the first alternation, it is 

 reinforced by a current wave reflection from the distant free end. 

 These reflections keep coming in, approximately in step with the 

 outgoing alternations, so that the final sending-end current is nearly 



