[time-nuts] Einstein's Clocks, Poincare's Maps: Empires of Time
Brooke Clarke
brooke at pacific.net
Sun Sep 6 23:00:14 UTC 2015
Hi:
I've been studying gyroscopes for quite awhile and reading a lot of books about them.
http://www.prc68.com/I/Gyroscopes.html#Books
That's how I came across the subject book, which is about the background of Poincare and Einstein leading to the theory
or relativity.
In Poincare's case it was telegraphic (longitude) surveying (where time comes from a telegraph line rather than a clock)
and in Einstein's case patents for clock synchronization.
In both cases they realized that time is part of a 4-dimensional time-space. But Poincare believed in the ether and
Einstein didn't.
https://en.wikipedia.org/wiki/History_of_special_relativity#Light_constancy_and_the_principle_of_relative_motion
https://en.wikisource.org/wiki/The_Measure_of_Time Poincare paper of 1898
https://en.wikipedia.org/wiki/Einstein_synchronisation
Einstein testified in the patent lawsuit brought by Auschutz against Sperry (Sperry lost). This led to his experiments
on how the gyroscopic motion of electrons in iron makes it ferromagnetic.
https://en.wikipedia.org/wiki/Einstein%E2%80%93de_Haas_effect
Leon Foucault developed the Foucault pendulum in order to demonstrate that the earth is turning, but didn't like the
demonstration because the period depends on the latitude of the pendulum so he spent about eight years developing the
physics of the gryoscope and named the device. He postulated that a gyroscope could be used to find the direction of
true North, but at that time (1852) there were no bearings or integrated flywheel-motors so the spin time was not long
enough.
In both cases Einstein's work at the patent office was not just a way to make money, like flipping hamburgers, but
rather a key source of ideas.
Mail_Attachment --
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
http://www.prc68.com/I/DietNutrition.html
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