Posted by MarkB_MI on July 17, 2016 at 17:00:33 from (70.194.0.55):
In Reply to: Re: DOT?? posted by Geo-TH,In on July 17, 2016 at 12:07:14:
>You're [sic] education is a result of Jimmy Carter's voluntary metric conversion act requiring all text books to drop English units and go to MKS. Which later returned to English units.
Afraid not, George. I completed my college physics in 1976, before Born Again Jimmy took office. Our president was a guy who had played football in a leather helmet, and you could tell. Today he's remembered more for pardoning a suspected criminal before he'd even been charged with a crime, rather than for signing the Metric Conversion Act of 1975.
Out of curiosity, I pulled out some of my old textbooks to see if I could find any references to the slug.
My statics and dynamics textbooks, published in 1975, are 100 percent SI. No mention of pounds or slugs.
My physics textbook, copyright 1975 is also SI-only. But it does mention the slug in a brief footnote on one page.
The interesting one is my thermodynamics textbook, copyright 1973. It is mixed English and SI units. But there isn't a single mention of the shell-less mollusk that is supposed to be the English unit of mass. Instead, "pounds-mass" (lbm) is the unit used throughout the book.
This is just one of many examples where scientists and engineers do things differently. Scientists are purists who can't stand the idea of two different units of measure sharing the same name. Engineers, on the other hand, are pragmatists who have jobs to get done. They don't see the value in converting everything to slugs when the pound-mass unit of measure works just fine.
Without looking it up, given the British fondness for naval warfare and artillery, I'm going to guess the slug is some sort of projectile. Let me know if I guessed wrong.
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