h a l f b a k e r yAssume a hemispherical cow.
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I remember as a kid reading about wetting strings of
tied
hands, as a method of Chinese torture. The string takes
in
water and somehow because of this CONTRACTS (rather
than
expanding).
Alternatively wet and dry the strings - perhaps using low
cost
sun collectors and surface (botanic)
cooling.
These could run a motor, either directly or by tying the
strings around a plastic tubing creating pneumatic
pressure.
If I'm not mistaken, hygrometers [edited... thanks 8th]
work on this principle.
Potential nemesis
Category_20Helper
It's all in the annos [normzone, Mar 17 2011]
(?) Hitler Lederhosen
http://thegloss.com...uld-not-be-a-trend/
The camera does not lie. [8th of 7, Mar 23 2011]
Foot binding - a mad practice indeed.
http://en.wikipedia...oot_binding#Process
Not for the squemish. [spidermother, Apr 15 2011]
Whool "felting" not "shrinking"
http://wiki.answers...hy_does_wool_shrink
[pashute, Jul 17 2011]
Look like Japanese check this idea
http://jacobi.fis.u...Abstracts/konno.pdf
Me read abstract. Seem like idea me. [pashute, Jul 17 2011]
Unshrinking whool
http://kottke.org/0...ke-an-idiot-i-threw
[pashute, Jul 17 2011]
Toy fridge that actually cools
recent idea vaguely related [xaviergisz, Jul 18 2011]
[link]
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But the interesting thing about this is that the string
CONTRACTS when water is applied. I don't think
energy extracted this way has been studied. It may
turn out to be efficient, and in any case unexplored
territory is always interesting. That's what HB is for. |
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// Yeah, I know, some of us see HB as a place to bash
other's ideas and throw fishbones. I even have a
personal fi... no matter. |
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Hygrometers. Some hygrometers use a hair as the sensing element. Hydrometers are typically a kind of ballasted float for measuring the density of liquids. |
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Not sure about string, but with leather or hide, it is the drying that causes the shrinkage. When you re-wet it it goes soft and stretchy, so if you had a spring to stretch it out, then as it re-dried it might contract against the spring, I don't know. I would guess the same goes for string. I would also guess that each wet/dry cycle degrades the material (you are basically using the cells swelling and dessicating) |
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Look at the bright side, [pashute], maybe your "personal fi..." is a potential nemesis (see link, it's all in the annos). |
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Zen, I'm the one to apologize. Here goes: Please
forgive me for reading your annotation with
suggested alternatives, as a contradiction to this
idea. |
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Now to the problems:
a. Zen says it may not unshrink when dried, after
shrinking caused by water.
b. Pocm says that both the torture and shrinking
happen when dried and not when wet. So there is
no anomaly to regular heating / cooling systems,
where heating (and in this case evaporation)
causes expansion, and cooling (in this case with a
fresh supply of water) causes detraction.
c. BigSleep (thanks!!) gives a theory that could
explain it, if the wetting is the cause for
detraction. |
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I'll check it and get back soon. |
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I read in 4th grade that Abe Lincoln had leather pants that shrank during a rain, leaving marks on his legs that stayed for the rest of his life. Yet none can dispute that these marks did not prevent him from going on to do great things. |
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So that's what made him taller, and consequently an
effective leader. If America were divided by the Civil
War, Hitler would've won. See? The world saved by
leather pants. |
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// The world saved by leather pants // |
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But, but, but Hitler was Austrian, and he also wore leather pants (Lederhosen). <link> |
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Maybe he just never went out in the rain in them ? |
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That's an interesting factoid about the Lincoln, however as much as I trust [bungston]'s authority on matters such as these, I'm not so confident in ten-year-old [bungston]. I've been trying to find a reference online to corroborate to no avail. |
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Wasn't he the one that couldn't tell a lie, so he Divided Gaul Into
Three Parts with his Father's axe, which had three new heads
and two new handles- making it very reliable, but extremely.
Difficult to carry and use- thus starting the Hundred Years Civil
War on Terror ? |
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Or was he the one with the 458 cubic inch V8 engine, and
chrome bumpers? |
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Or was that Gerald Ford, the man who said" You can buy any
congressman you like, as long as he's black? " |
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Although that might have been Benjamin Franklin Roosevelt, the
well known inventor of the Teddy Bear. |
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Maybe Hitler wore them as a deterrent because he
knew of our obsession to travel back in time and
pants him. |
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My grandfather's twin sister Reizy was killed on
one of the last days of the war: When freed from a
death march she was mowed down by an SS
machine gun, in front of her sister's eyes. The
sister Feiga was in an insane asylum in NY with
constant nightmares, till she passed away a few
years ago. My grandfather's father (an
accomplished violinist and also a school master),
mother and teenage brother were sent to one of
the Auschwitz camps and were killed the day they
reached the death camp in (Hebrew date: 28 Iyar)
1944 along with most of their village. |
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My other grandfather had a young brother who
stupidly left Israel to Poland for a good job as
Jewish leader (rabbi) of the town of Dubetzk. He
and his young wife were both shot and killed (I'm
still not sure if he had a child or not). |
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A total of 144 first grade family to my maternal
grandparents' (brothers sisters uncles aunts and
cousins with their immediate family: children and
spouses) where murdered, and at least 20 more
perished by starvation and sicknesses during or
immediately following the war. |
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My grandparents almost never talked about it, and
where always jolly and happy. They used to say: In
Romania we didn't feel the war. Then when my
grandmother passed away, we found two lists and
confronted my grandfather with them. |
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Some of the stories reached me recently through
surviving family members. It turns out that they
definitely did feel the war. |
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Such memories, [pashute]. The family history was impressive. |
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My memory is pretty fuzzy, but I seem to vaguely recall reading about something like the posted idea a long time ago, just once. It worked by the difference in string length in two loops, I think, which might be easier than making many wraps and trying to convert pressure into something useful. |
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It only stuck in my mind because I couldn't understand how it could work. Now, reading this and thinking about that, I say it will work. |
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My comparison is a string made of mesh bags with sponges in them. When the sponges expand in width, the wet segment will shrink in length. [+] |
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