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From: J. J. Lodder on 26 Mar 2010 04:52 Peter Ceresole <peter(a)cara.demon.co.uk> wrote: > J. J. Lodder <nospam(a)de-ster.demon.nl> wrote: > > > > Now, it's measured in wavelengths of light from a Helium-Neon laser. > > > However long that might be. All I know is that it's kind of *that* long. > > > > Obsolete too. > > The metre is nowadays the 1/299 792 458th part (light)second, > > No; that's why I said 'measured'. You've given the *definition*, but in > practice the measurement is done by interference using a helium-neon > laser. > > Actually, I use a tape measure. But the helium-neon thing is the > standard for calibration. It's not the metre, only a secondary standard approximating it. No different in principle from your tape measure, just some steps closer to the real thing, Jan
From: J. J. Lodder on 26 Mar 2010 04:52 T i m <news(a)spaced.me.uk> wrote: > On Sat, 20 Mar 2010 10:05:43 +0100, nospam(a)de-ster.demon.nl (J. J. > Lodder) wrote: > > > >Real life is much harder, > ><http://www.encyclopedia.com/video/GiQGx-XpN7E-mammoet-transport-paalweg > >-urmond.aspx> > > What a beautiful piece of kit. That said, it seems that a bit of damp > can slow it up a bit. [1] ;-( > > > >It will be used to ride out U-864, if all goes well, > > Is this still the recovery plan do you know? > > http://www.youtube.com/watch?v=OUy0laGmLTQ&feature=related That's the idea. Parliament still has to approve though. > I like the way the 'soft jaws' extend from the grab when picking up > the sub (I was thinking as the grab came over the sub "what stops the > grab damaging the sub and potentially making matters worse". ;-) > > At the end when the first half goes into the storage unit, what > happens to it next (or is that the end, entombment)? Both halves are to be salvaged. That's what the other shed is for. > What's your involvement in all of this if you don't mind me asking > Jan? Just curious, Jan
From: Peter Ceresole on 26 Mar 2010 04:59 J. J. Lodder <nospam(a)de-ster.demon.nl> wrote: > It's not the metre, only a secondary standard approximating it. > No different in principle from your tape measure, > just some steps closer to the real thing, Yes. Hence 'measured' rather than 'defined'. -- Peter
From: Pd on 26 Mar 2010 05:14 Rowland McDonnell <real-address-in-sig(a)flur.bltigibbet.invalid> wrote: > Pd <peterd.news(a)gmail.invalid> wrote: [...] > > Or indeed, unless you're talking about the Indian inch, which is about > > 0.02539997 metres. [...] > Your claims are only true if you use a very loose and woolly definition > of `now' that includes centuries past in your definition of `now'. I'd be willing to bet money that somebody in India right *now* is using a measuring stick/tape/pigeon marked out in Indian inches to mark out a plot for building. -- Pd
From: Phil Taylor on 26 Mar 2010 07:46
In article <1jfyex7.nf1nxnmzroyN%peterd.news(a)gmail.invalid>, Pd <peterd.news(a)gmail.invalid> wrote: > Rowland McDonnell <real-address-in-sig(a)flur.bltigibbet.invalid> wrote: > > > Pd <peterd.news(a)gmail.invalid> wrote: > [...] > > > Or indeed, unless you're talking about the Indian inch, which is about > > > 0.02539997 metres. > [...] > > Your claims are only true if you use a very loose and woolly definition > > of `now' that includes centuries past in your definition of `now'. > > I'd be willing to bet money that somebody in India right *now* is using > a measuring stick/tape/pigeon marked out in Indian inches to mark out a > plot for building. How could you tell? By your own figures the difference is about 30 nM. I really doubt that any measuring instrument used by a builder could demonstrate that sort of accuracy. Phil Taylor |