Nikola Tesla: Colorado Springs Notes, 1899-1900 Page 291

On the basis of these readings the following results are obtained: In the first experiment when the wire was attached, the inductance in primary was: 4 $! {13 \over 16} $! turns + conn. = 14,526 cm. Calling again C_s1 capacity of excited system we have

C_s1 = $! {{0.0162 \times {14,526 \over 10^{9}}} \over {{6 \times 10^{6}} \over 10^{9}}} $! mfd

C_s1 = $! {{0.0162 \times 14,526 \times 9 \times 10^{5}} \over {6 \times 10^{6}}} $! = 35,298 cm.

In the second case with wire 50 long attached to the excited system the capacity of primary being the same as before and the inductance of primary being 14 3/4 turns + conn = 51,004 cm, we have:

C_s2 = $! {51,004 \over 14,526} $! C_s1 = $! {51,004 \over 14,526} $! x 35.298 = 3.511 x 35.298 = 123.931 cm.

Hence capacity of wire

C_s2 - C_s1 = 123.93 - 35.298 = 88.632 cm.

Now with ball at its lowest position capacity in primary was as before and inductance 16 1/4 turns + conn. = 56,779 cm. Hence

C_s3 = $! {56,779 \over 14,526} $! C_s1 = 3.9088 x 35.298 = 137.973 cm.

From this effective value of ball at the height of 10' 1" was

C_s3 - C_s2 = 137.973 - 123.931 = 14.042 cm.

With ball at a height of 33' 8" the inductance in primary was 57,502 cm. and at the height of 57' 3" it was 58,223 cm. As the capacity in primary was the same the values for C_s4 and C_s5, respectively, are at once found since

C_s4 = $! {57,502 \over 56,779} $! C_s3 and C_s5 = $! {58,223 \over 56,779} $! C_s3

From this we find

C_s4 = 1.0127 x 137.973 = 139.725 cm, and C_s5 = 1.02543 x 137.973 = 141.482 cm.

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