Various Tesla book cover images

Nikola Tesla Books

Books written by or about Nikola Tesla

Colorado Springs

July 1, 1899

Various ways of connecting apparatus when applying condenser Method of Magnifying effects. The charging or discharging of the condenser is controlled by the effects transmitted through the media and the condenser discharges are passed through the primary of the oscillatory transformer. The diagrams below show various arrangements with the instruments in the secondary of the transformer.

In these arrangements the primary is not shown. The same is assumed to be connected in the circuit in any way but so that the charging or discharging of the condenser is controlled by a sensitive device affected by the feeble effects which are to be magnified. In the above diagrams S is the secondary of oscillatory transformer, B battery to strain sensitive device in secondary; A’ sensitive device, R fine relay (magnetic); C condenser in secondary. The primary circuit which is not shown includes: a sensitive device, battery, condenser and make-and-break device. This method with two sensitive devices is very good.


July 1

On schematic, the parts of receiver for registration of signals transmitted by wireless method are shown on the schematics. The complete receiver consists of two sensitive devices, of which the one in primary is not shown. There is a capacitor in the primary, the charging and discharging of which is controlled by signal via "sensitive device". Here Tesla studies the characteristics of either circuits or explains the roll of capacitor "C" in the secondary circuit.


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.