Path: csiph.com!fu-berlin.de!uni-berlin.de!not-for-mail
From: Gene Heskett <gheskett@shentel.net>
Newsgroups: comp.lang.python
Subject: Re: What exactly is "exact" (was Clean Singleton Docstrings)
Date: Tue, 19 Jul 2016 16:35:45 -0400
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On Tuesday 19 July 2016 13:46:37 Lawrence D=E2=80=99Oliveiro wrote:

> On Wednesday, July 20, 2016 at 12:07:25 AM UTC+12, Gene Heskett wrote:
> > This klystron amplifier, a new one of which was north of $125,000 in
> > the 1970's when I learned about them, is a long tube, around 5 feet
> > long with alternating sections of copper tubeing and ceramic
> > insulators separating the copper sections. Typically 4 ceramic
> > sections, each of which was sealed to a section of copper equiped
> > with contact rings on each end of the copper sections. A tunable box
> > cavity connected the copper sections together, bridging the ceramic
> > spacer, so that when the tube was "dressed" with these cavity's, and
> > lowered into its focusing magnet, (2200 lbs) you could feed about 1
> > watt of signal into the top cavity...
>
> What is this =E2=80=9Cwatt=E2=80=9D of which you speak? How much is that =
in
> foot-poundals per second?

A unit of electrical power, simplified to 1 volt at 1 amp =3D 1 watt when=20
that currant is passed thru a 1 ohm resistor.  But since the majority of=20
radio frequency stuff is designed for a characteristic impedance of 50=20
ohms, then the currant is 20 milliamps while the voltage rises to 50=20
volts.

And I am not familiar with this foot-poundals per second that you=20
question about, but just from the wording I'd say it is a fifty dollar=20
way to say horsepower. Which is defined in the area of exerting a force=20
to a 440 pound weight, sufficient to lift that weight one foot in one=20
second.

Thats for an average horse. I was once in the seat of a stuck in the mud=20
clear above the drawbar of a 1930's Case LA farm tractor. About 8500=20
lbs. Daddy whistled up King & Colonial, a pair of perches that between=20
them weighted a hundred or so above the 4000 pound mark on the dial at=20
the elevator. :) He also dug out a brace & bit to make a new double-tree=20
out of a 7 foot length of well seasoned Iowa oak cut full native size of=20
2" thick by 12" wide.  And despite the rationing in effect at the end of=20
WW-II when this took place, found a lb of sugar cubes for his overall=20
pocket.  Harnessing up the perches, he hooked the traces to this new=20
double-tree, and cleviced a 75 foot length of 1/2" chain to it. He=20
brought them down to where the tractor could be reached from fairly dry=20
ground, drug that chain down and hooked it to the back frame of the 4=20
bottom 16" plow I was pulling at the time, pulled the hitch pin after=20
digging down to it, waded back the the perches and took a place where he=20
could grab the bridals and made tsk tsk noises. Pulling the plow was=20
done so it would not be in the way.  Lead them back and brought the=20
chain back & hooked it to the drawbar.  Walking back to the horses he=20
had a small handfull of sugar cubes in each hand and gave it to them.=20
Then grasping the bridals again, a push forward with the tsk tsk. Then a=20
whoa. They had found they were stuck and would need to put some real=20
pull on that chain the next time, which they did, digging a trench under=20
their bellies for about 10 feet when daddy said whoa again. The tractor=20
had moved.  So he gave me instructions to put it in reverse and to be=20
ready to slam the clutch lever home the next time it moved.

After a breather, wash, rinse and repeat and the tractor was back on dry=20
ground.  At peak pull, that 75 feet of 1/2" log chain was up in the air=20
about 6" in the middle.  Now if any of you know how to convert that=20
mid-sag amount, the pull on the chain can be deduced, its called the=20
intercept point method. My guess is that that 4100 lbs of horseflesh=20
were peaking at 10,000 lbs on the far end of that chain.  They of course=20
can't do it for very long, 10 seconds perhaps, but by then I was loose=20
and all they were dragging was the chain.

The horses got the rest of that pound of sugar cubes.  Those were the two=20
most gentle giants I have ever lived around. WW-II ended just a couple=20
months later with V-J day.

Cheers, Gene Heskett
=2D-=20
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
=2DEd Howdershelt (Author)
Genes Web page <http://geneslinuxbox.net:6309/gene>