>  http://www.google.co.nz/search?hl=en&q=scrith&meta=

Fabulous... thanks. 38 years is enough time to forget, I guess.



On 4/2/08, Apptech <apptech@paradise.net.nz> wrote:
> >> >> Think big :-).
>
> >> > Recommend perusal of Freeman Dyson's approach ...
>
> >> Or Larry Niven's.
>
> >> It's very hard to spin a sphere in enough dimensions at
> >> once.
>
> > Figure the area of a ring 1 mile wide X  2.9X10^8 miles
> > circumference.
>
> I meant a sphere when I said a sphere.
> Dyson proposed a sphere, Niven a ring.
>
> In fact, if you read Dyson's comments subsequently he was
> probably thinking more of a conceptual sphere than an
> unobtainium shell per se. You use all the planetary mass to
> make a "speher" but it need not be all tightly linked into a
> 'walkable' surface. Night is always there, just out the back
> door. And the nights do get rather cold. Depending on the
> thermal transmissivity of the scrith*.
>
> Spinning a ring can give you something close to gravity. A
> spherical shell can't be give a gravity like foprce all over
> by spinning. Even spinning it in one plane does interesting
> things as you get off plane. Spinning it in two planes at
> once would at first glance be most interesting and at second
> glance probably only equivalent to spinning it in a single
> plane at the vectos sum angular rate.
>
>
>         Russell McMahon
>
> * http://www.google.co.nz/search?hl=en&q=scrith&meta=
>
>
>
>
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