426 Prof. J. A. Fleming on the Propagation of 
in that circuit by the formula * 
6 
et 5 x 10 (12) 
V Capacity in “microfarads x Inductance in centims. 
TasLE [TV.—Measured Inductances and Calculated Frequen- 
cies in the Leyden-jar Circuit corresponding to the Funda- 
mental Hlectrical Oscillation of the Spiral and_ to 
different distances of the Earth-wire. 
Capacity of the leyden-jars =0°0028 microfarad. 
/ | 
Distance of earth- | masngtance of jar | Calculated frequency | 
wire from helix | ore i. | of the oscillation. | 
in centims. | eg cage . N. | 
| | | 
2 193,600 0-215 x 10° | 
3 | 157,600 | 0238 ,, 
4 | 150,600 | 0-243 ,, | 
5 / 141,600 0251." ,, 
6 | 132,600 0260 __,, 
i 123,600 0'269 .,, . 
8 111,600 | 0-283 _,, 
85 107,600 0288 _se,, | 
Earth-wi 
re removed. | 102,600 O'2D5'\ 4, 
TasLE V.—Measured Inductances and Calculated Frequencies 
in the Leyden-jar Circuit corresponding to the First 
Harmonic Electrical Oscillation of the Spiral and to 
different distances of the Earth-wire. 
Capacity of leyden-jars=0:00071. 
Distance of earth- Inductance of jar | Calculated frequency 
wire from helix | circuit in centims. of the oscillation. 
in centims. | L. | 2. 
a | 
2 76,100 0:680 x 10° | 
3 68,600 O71) | 
4 67,100 ORO ve | 
5 62,600 Tou +t ) 
6 59,600 | 0-769 __s,, / 
4 56,600 0789: ..., | 
8 54,600 | 0302 ,, / 
8°5 52,600 | 0815" |. ) 
| Earth-wire removed. 50,600 (BBs Fey | 
* See J. A. Fleming, Cantor Lectures before the Society of Arts of 
London. ‘On Electrical Oscillations of Electric Waves,’ 1901. 
Lecture I, 
