Various Tesla book cover images

Nikola Tesla Books

Books written by or about Nikola Tesla

The relay is affected by the break in this disposition but the action was good in some instances; probably secondary S was more effective in breaking through the sensitive device a.

This disposition is simple and secures good results but one disadvantage has been found in the short circuit of the secondary through the condenser, which is necessarily too large for the high tension secondary since it fits the primary P. The above defect is reduced largely by the introduction of regulable self-induction L, or similarly a resistance is used instead of L. In all these dispositions of apparatus the effect upon the sensitive device is rendered accumulative.

Colorado Springs

July 18, 1899

Other arrangements of apparatus experimented with.

90

July 17-18

This is a continuation of the work described in the entry of June 12th, with different combinations of the same components plus relay R for registering the signals received. In all the circuits the sensitive device has an accumulating function. He experimented with different modifications trying to optimize sensitivity and reliability. The circuit in Fig. 1 of July 18th has two batteries, and that Fig. 5 an autotransformer instead of the usual transformer with a primary and secondary.


July 17-18

This is the continuation of July 12 work with new schematics - new combinations of the same components along with the additional relay r. which serves for the purpose of received signals registration. In all circuits the effect on the sensitive device is accumulative. Various combinations with which he experimented represent attempts to find the best elements layout from the viewpoint of sensitivity and reliability. The circuit in Fig. 1, July 18, consists of two batteries, and that in Fig. 5, July 18, consists of an auto-transformer instead of the standard transformer with primary and secondary.

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.