Nikola Tesla: Colorado Springs Notes, 1899-1900 Page 255

L = $! {\sqrt{64.0465} \over 887} $! = $! {8.003 \over 887} $! = 0.009023 H or 9,023,00 cm.

This is smaller than before found because the turn before last was wound a little higher up as at first sparks would break through. It is to be measured once more however.

Readings for Mutual Induction Coefficient.

Two primary turns in series:

From this E = MωI, M = $! {{34 \times 10^{9}} \over {880 \times 45.4}} $! = 851,021 cm.

Readings with current through the secondary gave:

From later readings M = $! {{13.4 \times 10^{9}} \over {17.8 \times 872}} $! = 863,313 cm.

This is a little larger probably due to variation of ω. Readings were now taken for each of the primary turns separate with the following results:

Upper primary turn, nearer to secondary:

From this M_{upper pr.} = $! {{6.9 \times 10^{9}} \over {17.9 \times 872}} $! = 442,059 cm.

M_{upper pr.} = $! {{11.8x10^{9}} \over {30.1 \times 880}} $! = 445,484 cm.

The difference again in all probability to be ascribed to variation of ω.

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