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From: ".arpis." <rpglover64+jbobau@gmail.com>
Date: Sun, 12 Aug 2012 11:34:35 -0400
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Subject: Re: [lojban] Re: Direction of Rotation
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Right hand rules are a series of mnemonics (usually taught in physics)
for remembering the arbitrary but consistent directions and sign
choices. An example: If the current is flowing in the direction of
your thumb, the electric field is in the direction of your fingers (on
the right hand).
Left hand rules can be used, but negate one sign (in the math
representation) relative to the right hand rules.

A useful right hand rule for lojban might be "the direction your
fingers curl when you point your right thumb at your face"

On Sun, Aug 12, 2012 at 3:04 AM, Gleki Arxokuna
<gleki.is.my.name@gmail.com> wrote:
> So Robin entered right-hand rule to Gismu issues page.
>
> Can you provide some examples of it's usage with all places filled in? Is it
> culturally-neutral (both left and right direction can be equally used)?
>
> btw, lindar started this topic because he NEEDED a way of expressing the
> concept of "clockwise".
>
> doi loi jbobadna, where are the examples after all?
>
> On Sunday, August 12, 2012 12:34:00 AM UTC+4, aionys wrote:
>>
>>
>>
>> On Sat, Aug 11, 2012 at 10:11 AM, djandus <jan...@gmail.com> wrote:
>>>
>>> I don't have time to go over every post in this thread, especially seeing
>>> as it is rather full of people getting offended.
>>>
>>> Has anyone brought up the right-hand rule? (for rotations)
>>>
>>> That is, for the wheels on a car, I could say:
>>> {lo karce xislu cu carna zo'e lo zunle be lo karce}
>>> because if you were to stick your right thumb to the car's left, your
>>> fingers would curl around in the direction of rotation. This is consistent
>>> with the overall standard of the right-hand rule, which comes up on this
>>> topic via the cross product definition of angular motion. That is, if I were
>>> to be asked the "direction" of the angular motion, momentum, or similar, it
>>> would be to the car's left. This is arbitrary, but completely standardized
>>> in physics.
>>
>>
>> I believe Pierre did, yes.
>>
>>>
>>> Similarly, I would say that a top would be {carna zo'e lo gapru} if it
>>> were spinning counter-clockwise when viewed from above. If I were to
>>> instruct one to remove a screw, I could say {ko cargau lo klupe ku zo'e lo
>>> bartu}, because the direction a screw moves and the direction it needs to
>>> rotate correspond by the same standard right-hand rule. If I were to use the
>>> carna2 spot, the axis would probably be defined with a direction as
>>> "positive," after which I could then use {li ni'u}/{li ma'u} in carna3.
>>> (This would be the establisment of a coordinate system.) If the axis was
>>> given descriptively without a direction, then my other examples illustrate
>>> how I would deal with that.
>>>
>>> Is there anything terribly wrong with these examples?
>>> mu'o mi'e djos
>>
>>
>> I don't see anything.
>>
>> --
>> mu'o mi'e .aionys.
>>
>> .i.e'ucai ko cmima lo pilno be denpa bu .i doi.luk. mi patfu do zo'o
>> (Come to the Dot Side! Luke, I am your father. :D )
>>
> --
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-- 
mu'o mi'e .arpis.

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