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Nikola Tesla Books
From this follows: the inductance in primary circuit in the first case was 75,548 cm, in the second case 12,319 cm referring to table of inductances before used. Hence capacity of excited system in first
Cs1 = $! {{0.0378 \times 75,548} \over {6 \times 10^{6}}} $! mfd, or $! {{0.3402 \times 75,548} \over 60} $! cm = Cs1
And similarly Cs2 = $! {{0.3402 \times 12,319} \over 60} $! cm, Cs2 being capacity of excited system in second experiment. This gives for actual or effective capacity of structure with hood
Cs1 - Cs2 = $! {0.3402 \over 60} $! (75,548 - 12,319) cm = $! {0.3402 \over 60} $! x 63,229 cm = 358.5 cm.
* Small corrections for inductance may have to be taken later.
Effective capacity of structure of iron pipes with new hood again determined by resonance method. The new “extra coil” was used, its inductance being as before 0.02 H. The readings were as follows:
Coil with structure and connecting wire | |
Capacity in primary | Inductance in primary |
5 x 36 - 12 = 168 bottles = 0.1512 mfd | 20 3/8 turns + conn. |
Coil with connecting wire alone placed at 4 ft. distance | |
4 x 36 = 144 bottles = 0.1296 mfd | 7 turns + conn. |
other readings: | |
50 bottles = 0.045 mfd | 17 1/4 turns + conn. |
40 " = 0.036 mfd | 20 turns + conn. |
38 " = 0.0342 mfd | 20 3/4 turns + conn. |
39 " = 0.0351 mfd | (approx) 20 3/8 turns + conn. |
From these readings follows:
Inductance in first case, with structure, in primary was 20 3/8 turn + conn. = 72,661 cm.
Inductance in second case, without structure, in primary was 7 turn + conn. = 21,894 cm.
Calling Cs1 and Cs2 the effective capacities of the excited system in the two cases respectively, we have:
Cs1 = $! {{0.1512 \times 72,661} \over {2 \times 10^{7}}} $! mfd, and Cs2 = $! {{0.1296 \times 21,894} \over {2 \times 10^{7}}} $! mfd, hence
Cs1 - Cs2 = $! {{0.1512 \times 72,661 - 0.1296 \times 21,894} \over {2 \times 10^{7}}} $! =
= $! {{10,986.3432 - 2837.4624} \over {2 \times 10^{7}}} $! = $! {8148.8808 \over {2 \times 10^{7}}} $! mfd,
or
$! {{9 \times 8148.8808} \over {2 \times 10^{2}}} $! cm=366.7 cm.
effective capacity of structure with hood.
303
November 26
He gives the description of some details of the structure with metal sphere on top. He measures the capacitance of this system in combination with a coil with 344 turns and a new "additional coil". Earlier, on Nov. 7, he performed the capacitance measurement of the same structure, but without protective cover, and with the "additional" and experimental" coils. On Nov. 12 he performed similar measurement with coil of 1314 urns, and on Nov. 26 he recalls results of Nov. 7 with new "additional" coil. In the notes there is one more result with the "additional" coil, with the most improved method of determining resonance (please see Nov. 13). This result, which otherwise is quite different from others, is not mentioned on Nov. 26.
There is a remark at the end of the notes of Nov. 26 when he foresees the possibility of systematic errors in determining the resonant frequency and Tesla emphasized that this has to be checked.