Re: Bush to consider shutting down GPS in extreme emergency
From: Juergen Nieveler (juergen.nieveler.nospam_at_arcor.de)
Date: 12/20/04
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Date: 20 Dec 2004 11:09:08 GMT
Mxsmanic <mxsmanic@hotmail.com> wrote:
>> So? You know how far away from straight it's supposed to be, so you
>> can measure it.
>
> How?
Simple geometry. Ask your maths teacher. Hint: Right-angle-triangles
are involved.
>> The only points of the tunnel where it comes to the surface are the
>> exits.
>
> The tunnel doesn't have to come to the surface.
It would be kind of useless if it wouldn't come to the surface at
some point...
>> You check at regular intervals.
>
> To see what mistakes you've already made?
Yes. And then you correct the mistakes. We're not talking about
meters here, but centimeter-size mistakes at the worst.
>> Not for this kind of tunnel. You can only drill through the rock -
>> there was no alternative.
>
> You said tunnelS.
We were talking about the Eurotunnel.
> Lasers can't be used through solid rock, even you have acknowledged
> that.
Yes. But the parts of the tunnel that already have been finished
aren't solid rock. All you need to do is make sure that the drilling
machine goes on straight - and that's easy.
Juergen Nieveler
-- If at first you don't succeed, change the rules.
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