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Nikola Tesla Books

Books written by or about Nikola Tesla

Nikola Tesla: Colorado Springs Notes, 1899-1900 Page 290

November 17-18, 1899

Cs4 = $! {59,665 \over 23,157} $! x 34.386 = 88.597 cm. According to this the effective value of the 3rd piece 3 meters long would then be

Cs4 - Cs3 = 88.597 - 70.02 = 18.577 cm.

When 12 meters wire were attached the inductance of primary was found to be 19 turns + conn. = 67,367 cm. Hence similarly Cs5 = $! {67,367 \over 23,157} $! x 34.386 = 106.034 cm, and from this the value of 4th piece of wire

Cs5 - Cs4 = 100.034 - 84,307 = 15.727 cm. But according to second reading it would be:

100.034 - 88.397 = 11.437 cm, only.

Finally, when 15 meters were attached the inductance in primary was: 21 1/2 turns + conn. = 73,142 cm, and therefore: Cs6 = $! {73,142 \over 23,157} $! x 34.386 = 108.609 cm. and this would give as value of the last piece of three meters

Cs6 - Cs5 = 108.609 - 100.034 = 8,575 cm only.

Here possibly inductance of wire begins to assert itself. These values as found are still to be considered.

Colorado Springs

Nov. 18, 1899

Experiments were continued to ascertain influence of elevation upon capacity of a system connected to earth as in previous instances. Coil 344 turns referred to before was again used. Also wire vertical No. 10, 50 feet length and ball 30" diam. The procedure was as in a similar case before. The results were as follows:

Coil without vertical wire.
Capacity in primary Inductance in primary
$! {36 \over 2} $! = 18 bottles = 0.0162 mfd 4 13/16 turns + conn.
Coil with vertical wire No. 10, 50 feet.
$! {36 \over 2} $! = 18 bottles = 0.0162 mfd 14 3/4 turns + conn.

290

Contents

Introduction
June 1 - 30
July 1 - 31
August 1 - 31
September 1 - 30
October 1 - 31
November 1 - 30
December 1 - 31
January 1 - 7
Commentaries

Appendices: I, II

Images

Glossary

Lowercase tau - an irrational constant defined as the ratio of the circumference of a circle to its radius, equal to the radian measure of a full turn; approximately 6.283185307 (equal to 2π, or twice the value of π).
A natural rubber material obtained from Palaquium trees, native to South-east Asia. Gutta-percha made possible practical submarine telegraph cables because it was both waterproof and resistant to seawater as well as being thermoplastic. Gutta-percha's use as an electrical insulator was first suggested by Michael Faraday.
The Habirshaw Electric Cable Company, founded in 1886 by William M. Habirshaw in New York City, New York.
The Brown & Sharpe (B & S) Gauge, also known as the American Wire Gauge (AWG), is the American standard for making/ordering metal sheet and wire sizes.
A traditional general-purpose dry cell battery. Invented by the French engineer Georges Leclanché in 1866.
Refers to Manitou Springs, a small town just six miles west of Colorado Springs, and during Tesla's time there, producer of world-renown bottled water from its natural springs.
A French mineral water bottler.
Lowercase delta letter - used to denote: A change in the value of a variable in calculus. A functional derivative in functional calculus. An auxiliary function in calculus, used to rigorously define the limit or continuity of a given function.
America's oldest existing independent manufacturer of wire and cable, founded in 1878.
Lowercase lambda letter which, in physics and engineering, normally represents wavelength.
The lowercase omega letter, which represents angular velocity in physics.