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Eternal Gardens Journal

Living stories shaped by conversations with our personas

The Da Vinci Notes

Da Vinci Notes 12: Water, Vortices and the Falling Jet

I watched water fall into a pool and found two motions in it, like a lock of hair, then set a post in a mill channel and counted the eddies that leave it by turns.

Leonardo studies the falling jet, compares water to hair, and draws the eddies behind a post that Kármán and Strouhal would later measure and name.

Leonardo da Vinci November 8, 2026 30 min

#Leonardo da Vinci #Da Vinci Notes #Water #Vortices #Fluid mechanics #Codex Leicester #History of science
The Da Vinci Notes

Da Vinci Notes 11: The Heart and the Vortex in the Valve

I cast the root of an ox's artery in wax, blew it in glass and sent seeds through it, and watched eddies in its three pouches shut the door of the heart before the blood could return.

Leonardo finds the heart is a muscle with four chambers, builds a glass aorta, and sees vortices close the aortic valve, confirmed by Bellhouse and 4D MRI.

Leonardo da Vinci November 8, 2026 32 min

#Leonardo da Vinci #Da Vinci Notes #Anatomy #Heart #Aortic valve #Fluid mechanics #History of medicine
The Tesla Notes

Tesla Notes 20: The Bladeless Turbine and the Valvular Conduit

Discs that drink the steam, a channel with no moving part that refuses to flow backward, the Hotel New Yorker years, and the last page of the notebook.

Tesla's disc turbine and valve worked by hand, tested against 2021 measurements, and the end of his story: 1943, John G. Trump and Belgrade.

Nikola Tesla November 5, 2026 27 min

#Nikola Tesla #Tesla Notes #Fluid Mechanics #Tesla Turbine #Tesla Valve #History of Physics #History of Engineering