Various Tesla book cover images

Nikola Tesla Books

Books written by or about Nikola Tesla

Nikola Tesla: Colorado Springs Notes, 1899-1900 Page 143

August 8-9, 1899

In Fig. 4. for instance, the resistance of device a unexcited being practically infinite an other battery B1 with self-induction coil l1 was placed around the condenser to excite the same and by the action of secondary S also sensitive device a.

Again in Fig. 5. around the ends of the primary P was connected a Battery B1 in series with buzzer b and adjusted self-induction l1. The latter was so graduated that the induced currents in S would strain the device a to the point of breaking down. Still another such plan was tried by placing a separate circuit comprising coil P1 Battery B1 and buzzer b at a suitable distance of secondary S, such that the preparatory excitation of device a was effected.

Colorado Springs

Aug. 9, 1899

Other dispositions of apparatus experimented with. One of the plans before described was modified in the manner illustrated in 1., the battery B1 which effected the preparatory excitation being placed as indicated so as to work through the primary P and conjointly with main battery B.

Fig. 2. illustrates a disposition similar to one experimented with before, only in series with buzzer b and auxiliary exciting battery B1, a primary which was adjustable

143

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.