Wire Transmitting Electric Waves. 



65 



B. The Hertzian Oscillators. 



With the Hertzian oscillators the results were quite different 

 from those just given, and indeed they differed considerably 

 among themselves. 



The first oscillator tried had sheet-zinc plates 40 cms square, 

 with the straight wire between them 60 cms long ; and the wire 

 transmitting the waves was 860 cms long. One minimum was 

 very well marked;, but there were no more clear ones. Then a 



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DISTANCE FROM FREE END OF WIRE IN CMS. 



second oscillator, with 20 cm plates, and otherwise of just half 

 the size of the former was tried, but the minimum, instead of 

 being half the distance from the end, was much farther from 

 it. This led to the making of additional oscillators, with plates 

 10, 15, 25, 30, 35, 50 cms square, respectively, and with the wires 

 between of proportional length. The spark-knobs were 19 mm 

 in diameter, the same knobs being used with all the oscillators. 

 Using these oscillators, readings were taken with wires from 

 100 to 860 cms long ; and the results obtained are exhibited in 

 the accompanying table and curves. In the table, the posi- 

 tions of the minima are given by stating their distances in cen- 

 timeters from the free end of the wire. There was always one 

 more marked than the others, and this one, indicated in the 



Air. Jour. Sci.— Fourth Series, Yol. XV, No. 85.— January, 1903. 

 5 



