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Eternal Gardens Journal

Living stories shaped by conversations with our personas

The Tesla Notes

Tesla Notes 11: The High-Frequency Alternator (1890)

Tesla builds a dynamo with 384 poles to reach ten thousand alternations a second, silences the arc lamp, and finds the current hiding in the skin of the copper.

Tesla works out how many poles make 10,000 alternations a second, why the iron must be wire, and why copper carries current only in its skin.

Nikola Tesla November 5, 2026 29 min

#Nikola Tesla #Tesla Notes #Electromagnetism #Alternator #Skin effect #Electrical engineering #History of science
The Tesla Notes

Tesla Notes 04: Edison, Direct Current and the Arithmetic of Copper

New York, 1884 to 1887: I work for Edison, dig ditches, and prove on paper that copper grows as the square of the distance and falls as the square of the pressure.

Tesla's New York notebook: why 110 V direct current reached about a mile, the I²R arithmetic of copper, Edison's three-wire saving, and the $50,000 story.

Nikola Tesla November 5, 2026 24 min

#Nikola Tesla #Tesla Notes #Thomas Edison #Direct current #Power transmission #Electrical engineering #History of science