Electric Waves along Spral Wires. 427 
The inductances required in the jar circuit to produce the 
first, second, fourth, and fifth harmonics were also determined 
for |certain distances of the earth-wire and also when the 
earth wire was removed, the position of the nodes being 
at the same time taken. The first node is that nearest to the 
open end of the spiral farthest removed from the end at 
which the electromotive force is applied. All theories of the 
production of stationary waves on wires agree in making the 
distance between the first and second nodes equal to one half 
of a wave-length. Hence these distances are given in 
Table VI., and for comparison the frequency of the funda- 
mental for the same earth-wire distance. 
Taste VJ.—Measured values of the Inductances and Capa- 
cities in the Condenser Circuit and Calculated Frequencies 
required to produce the Fundamental and the various 
Harmonics on the Helix. 
Glass Condenser. 
: | 
Inductance | Capacity Wave- hat 
Oscillation. | incentims.| in mfds. |"Teduency. length. jh Wielpesey | 
C. N. “ / mr. 
j 
Earth-wire 2 cms. down. 
Fundamental...... ' 195,600 0:0028 | =O hye LOS 920 | 198x105 | 
Ist Harmonic......| 69,100 | 000071 | -714 ,, | 276 | 197. ,, 
2nd ieee sheen | 26,600 us gic Ist | 160 184 |; 
3rd ieee ee 15,100 | - L5a0 5, 115 BGP S504 
4th Re ee eect 10,600 / ” 1°823__,, 88 160 ,, | 
5th gn ate 8,600 | - 2025: ,; hoe bl4o. 3 
Karth-wire 3 cms. down. 
Fundamental...... | 157,600 00028 |; :238~x10° | 857 204 x 10° 
1st Harmonie...... ' 68,600 0:00071 afl Weer’ 280. 7 | aa 
2nd oh ax bemnaes oe. 26,600 : cea ee 160 184 _,, 
3rd Tie Wines Tae 15,100 ue F535. 4, isa | 176i; | 
4th tg Rae 10,600 ue 1823 ,, 88 160: *. 
dth ew, “iets 8,600 a O23. G2 146 ,, 
| 
Earth-wire removed. 
Fundamental...... 102,600 0:0028 °295x« 10°; 800 236 x 10° 
lst Harmonic...... 50,600 0:00071 | "834 =, 280 23a 95 
2nd ee 21,600 : 1:306_,, 160 209 
3rd ah ba” gees 13,600 is L6IG. .: Pi5 1s5as- 
4th soy. Woe 10,100 se ks Coe 88 164 _ ,, 
5th jee? eee 7,100 = ie aaa | 72, i gl 
