Nikola Tesla: Colorado Springs Notes, 1899-1900 Page 303

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

C_s1 = $! {{0.0378 \times 75,548} \over {6 \times 10^{6}}} $! mfd, or $! {{0.3402 \times 75,548} \over 60} $! cm = C_s1

And similarly C_s2 = $! {{0.3402 \times 12,319} \over 60} $! cm, C_s2 being capacity of excited system in second experiment. This gives for actual or effective capacity of structure with hood

C_s1 - C_s2 = $! {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:

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 C_s1 and C_s2 the effective capacities of the excited system in the two cases respectively, we have:

C_s1 = $! {{0.1512 \times 72,661} \over {2 \times 10^{7}}} $! mfd, and C_s2 = $! {{0.1296 \times 21,894} \over {2 \times 10^{7}}} $! mfd, hence

C_s1 - C_s2 = $! {{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.

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