Going deeper
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For nearly the tenth time in the thread, it doesn't refer to the screw.
Perhaps you're having trouble realizing this because the arbitrary association between clockwise and "right" was so ingrained in your mind at age 5 by parents repeatedly demonstrating the motion while reciting a nonsense rhyme?
There is no obvious connection. And using a steering wheel is no different.
You're describing a lateral motion. Neither the hand nor the screw moves laterally. I don't see how you perceive the motion of a hand for driving a screw as clearly "right" or "left". It is both at once.
What exactly are you basing it on? Where the index finger ends up? How are we supposed to know this? This is supposed to be without pre-existing knowledge, remember? And this falls apart easily, because not everyone starts with the same grip, especially when you introduce things like screwdrivers. And when using a wrench, the correct direction is any of right, left, up, or down, depending on where it is at any given time.
This would all be solved if we ditched this righty / lefty nonsense and just taught people what clockwise actually means. The easiest way to do so is using a clock. Seriously, it is not as "abstract" as you're saying. You can even construct a mnemonic for it if you like -- how about "timey tighty"?
If I ask a kid to tighten a screw, using the "righty tighty, lefty loosey" mnemonic will inform them to turn/rotate it to the right
For example, If I ask a kid to tighten a screw, using the "righty tighty, lefty loosey" mnemonic will inform them to turn/rotate it to the right.
If anyone is implying that the kid will simply grab the screw and literally drag it to the right, then they are moronic...
Kids know what clockwise and anti-clockwise mean... That's not the point of a mnemonic. The whole purpose of a mnemonic is to build an easy to remember phrase that helps you remember more important concepts.
I doubt it is that difficult to remember that clockwise is tighten. It is one simple relation. The mnemonic requires you to remember more things than a sigle relation.
@ Hawkeye
I think you are missing the point.
That only works if your point of reference on the screw (or the hand) is at the 'top' edge. Otherwise it could well rotating to the top, bottom or left.
It is entirely relatively to the reference point you are using and the mnemonic doesn't specify that it should be the top.
Even without explicitly referring to clocks there is still the assumption that 12 o'clock (the 'top') is the starting point.
I doubt it is that difficult to remember that clockwise is tighten. It is one simple relation. The mnemonic requires you to remember more things than a sigle relation.
If this were the case, why does "righty tighty" exist in the first place?
They're called "right-handed" or "left-handed" screws because it takes less physical effort to apply clockwise torque with your right hand and vice versa.
You do realise that the majority of fasteners with threads are right threaded?
Left threaded fasteners are for special purposes (generally for rotating parts). It has nothing to do with it being easier to apply torque with your hands... It's more to do with preventing the rotating equipment from loosening (most heavy duty rotating motors as found in lawn mowers for example spin clockwise, or to the right).
You have misunderstood. I was explaining why the terms "right" and "left" are used, not proposing a reason why most are "right".
pernoctator said:They're called "right-handed" or "left-handed" screws because it takes less physical effort to apply clockwise torque with your right hand and vice versa.
Also, take note that they are called right-handed thread and left-handed thread, not clockwise thread and anti-clockwise thread![]()
Did you even read what I just posted?
I find it hard to believe that a 5 year old cannot understand the concept of righty tighty, lefty loosey.
This thread:
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...Zip file would not be substantially smaller than the first one (it may even be slightly larger). Again, this is because the data in the original Zip file is already compressed.
There are other file types that don't compress well. For example, certain types of encrypted data files, such as those used by home finance programs and some database products, will not compress very much.
FROM WINZIP
After having spent some time googling this silliness I've come to the conclusion that I may be slightly wrong (in terms of convention).
http://http://en.wikipedia.org/wiki/Right_hand_grip_rule#Direction_associated_with_a_rotation
However, having to look something up to explain a mnemonic sort of lessens it's usefulness (for me anyway).
Compression is always performed, even if the compressed
file is slightly larger than the original. Files of less
than about one hundred bytes tend to get larger, since the
compression mechanism has a constant overhead in the
region of 50 bytes. Random data (including the output of
most file compressors) is coded at about 8.05 bits per
byte, giving an expansion of around 0.5%.
all you need to visualize is a motion with a direction.
John R. Clarke, a professor of surgery at Drexel University in Philadelphia, estimates that about 15 percent of the population faces some degree of left/right challenge. Eric Chudler, a neuroscientist at the University of Washington in Seattle, puts the figure a bit higher, having found that more than 26 percent of college students and 19 percent of college professors acknowledge having difficulty telling left from right -- occasionally, frequently or always.
Screw you (away); screw me (toward). If you are sensitive enough to direction you can tell if you are screwing or being screwed.No wait. The problem is you can't tell the difference.
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Here in Australia all gas fittings are 'reverse thread'. I've known a few people to break their bbq fittings.
Yes, mnemonics are useless and a waste of time to memorize. Why can't everyone just memorize information exactly as it is. Bastards.