J.D. Jackson "Classical Electrodynamics" (undergrad EM text at CalTech)
page 363:
in footnote to Schumann resonances discussing Nikola Tesla in Colorado
Springs: "this remarkable genius clearly outlines the idea of the earth as a
resonating circuit (he did not know of the ionosphere), estimates the lowest
resonant frequency a 6 Hz (close to the 6.6 Hz for a perfectly conducting
sphere), and describes generation and detection of these low frequency
waves"

and straight from the horse's mouth, "Experiments with Alternate Currents of
High Potential and High Frequency" including the Appendix "Transmission of
Electric Energy Without Wires" , Nikola Tesla, 1904, pp 149-162 describe in
detail how Tesla made these measurements in the 1890's.

JD Jackson is a well respected authority on Electromagnetics. Tesla's book
was published in 1904.

The principles of radar were clearly demonstrated and used to calculate the
resonance of the earth (using time of flight of low frequency radio signals)
and the distance from Tesla's lab to the Rocky Mountain foothills.


"The_navigator©" wrote in message
...
Riiiiiiight.

Cheers MC

Myron Florin wrote:

The first reporter observation of radar effects (radio ranging) occured
in
the 1890's in Colorado Springs, Colorado. With the same principles, the
Schumann resonances of the earth were first discovered and measured.


"The_navigator©" wrote in message
...

Bwhahahahha. Who built the first radar array? Did the US even have an
array?


Cheers MC

Jeff Morris wrote:

We were spending
billions of dollars developing Radar to save Britain.