Diff for "SevenMeasures"

http://wiki.keithl.com/SevenMeasures

The Seven Measures of the World

Piero Martin 2021/2023 CedarMill 530.18 Martin

fusion researcher at University of Padova

Translated from Italian by Gregory Conti

• p008 stere cubic meter of cut firewood

• p008 meter defined as 1e-7 of distance from North Pole to Equator through Paris

• p009 1960 Oct 15 Hamburg: John/Paul/George/Ringo record Gershwin's Summertime Pete Best?

• p009 Original Système international d'unités was meter, second, kilogram, ampere, Kelvin, candela; mole added in 1971

• p011 Redefined 2018 Nov 16 by fundamental physical constants

• p016 1946 May 3 Einstein attends Lincoln University graduation, "first college degree for an African American student"

  • er, no, Alexander Lucius Twilight 1823 from Middlebury College in Vermont

• p021 Roman passus 1.48 meters 4.854 feet, left+right step, hence 29 inches per step

• p026 International Bureau of Weights and Measures in Sèvres? (or Saint-Cloud?) near Paris

• p028 Heinrich Hertz 1893? Maxwell electromagnetic waves "will have any practical application"

• p039 "c" either constant or celeritas (velocity)

• p049 Luxor Obelisk traded for mechanical clock in 1830

• p051 Galileo timing cathedral lamp swing, isochronism of the pendulum

• p052 Galileo draws first pendulum clock?

  • his son Vincenzo makes prototype? citation needed

• p052 Christiaan Huygens first functional prototype 1656

• p054 PLOS One 2020 Castro Úcar

• p054 Beethoven may have misread his metronome, too-fast tempo on symphony scores compared to modern interpretations

• p055 Quartz wristwatch 32768 Hz crystal, accurate to 15 seconds per month ? ... my digital watch is better than 5 seconds in six months

• p057 Cesium 133 clocks 9,192,631,770 Hz. Book error, says "per minute"

• p058 NIST Clock accuracy one second in 3e8 years, 1e-16

• p060 Picasso sketch: "it didn't take eight seconds to make this drawing, it took eighty years"

• p069 Atomic clock in Fréjus Road Tunnel altitude 1200m ran faster than in Turin 200m

• p069 special relativity slows GPS clocks by 7μs per day ... no faster, orbiting about 94% out of the gravity well minus 3% for orbital velocity. 7 microseconds or two kilometers per day

• p074 Laura Fermi Jewish, so Enrico and wife left Italy in 1938

• p074 Eugene Fubini ditto, followed Fermis to US

• p076 Fritz Haber also Jewish, developed Zyklon-B, died in Switzerland 1934

• p077 Erwin Planck hanged 1945 Jan 23 for Operation Valkyrie Hitler assassination attempt 19444

• p079 Talent 26? Kg ... if silver, a month's salary for trireme crew of 200

• p081 carat was weight of 200 mg carob seed

• p081 kilogram / liter of water redefined from 0℃ to maximum density 4℃, more stable

• p082 1875 International Prototype Kilogram gained 50 micrograms in 100 years

• p085 1919 eclipse test of relativity, wild New York Times headline reported from London by NYT golf correspondent

• p085 anecdote: Eddington told 3 people understood relativity; he wondered who the third was.

• p085 Feynman: many people understand relativity, nobody understands quantum mechanics

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