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Awaken The Lions In Truth's avatar

Jim you always hit it outta the park homerun with your essays including this one, further clarifying stuff for us plebs; thanks sir. You are a gem!

But i still don't know for sure what the "L" stands for in L5 news - I can guess but...

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Dennis Feucht's avatar

There is quite a bit to unpack in this one, Jim -

On the Kansas City hotel failure, I recommend civil engineering professor and engineering popularizer Henry Petroski as author of To Engineer Is Human in which he describes several modern engineering failures and what went wrong. His book, Invention by Design, is also recommended.

As for units and measurement, I spent much of my life designing electronic test and measurement instruments and have written about them; the open-source books are described at Innovatia.com. In the first volume, Instrument Electronics, first chapter, "Measurement Concepts" is a section that further elucidates units history, as follows:

Are There Divinely Given Units?

As a side-note only tangentially related to electronics (yet bound to be interesting to some electronics engineers), the metric and English units of length are related exactly, historically. Over the last few hundred years, refinement of the definition of an inch has caused it to change by about 0.1 % from its ancient origin rooted in the cubit as derived from accurate length measurements of the Great Pyramid at Giza in Egypt. There are 25 pyramid inches per cubit. (One rather extensive work in print, Great Pyramid Passages, by John and Morton Edgar, has a section, “The Great Pyramid unit of measure”, page 21 ff, that begins discussion of length units.) The cubit is defined as 1/10,000,000 the radius of the earth. The meter was originally defined as 1/10,000,000 the distance from the North Pole to the equator through a meridian that included Paris. There are 10^4 km per one-quarter the earth’s circumference if we ignore the imperfect sphericity of the earth. Given that both the cubit, for which

25 inches = 1 cubit

and the meter are based on the size of the earth, then the conversion from meters to cubits is exactly

pi/2 cubits = 1 meter

Because the inch traces back to very ancient times, Britain was reticent to adopt the metric system in the 19th century. A couple of knighted astronomers who were advisors to the government believed that because of the geometry of the Great Pyramid at Giza the cubit and inch units were divinely given and chose to stay with them. (Britain’s progeny in America have held onto them the longest.) The Great Pyramid is itself a fascinating mystery of the ancient world which has an intricate geometric interrelationship of constructs that only in the last two centuries have been coming to light. Whether the inch is a divinely-given unit or not, I leave that to you to decide. If so, the metric system, being related to it, would derivatively be divine in some sense. To not lose the sense of this chapter, we return to the more mundane engineering application of units, or what give the appearance of units.

As for calendars, the most basic and enduring measurement of time is the stars and the zodiacal division of it into 12 constellations. Before Mystery Babylon corrupted the pre-babylonian astrology, the unit of measurement of history was given by the precession of the earth as about 2160 years per age, where an age is 1/12 the precessional cycle of the earth. Based on it, we are now leaving the age of Pisces, the fish that early Christians used as their symbol - not the cross, which was the tau of Tammuz from paganism - and are entering the age of Aquarius, the water-bearer who is the Messiah, bringing life to earth.

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