Date: Apr 6, 2013 3:48 PM
Subject: Re: How precisely can a right angle be measured?
On Wednesday, April 3, 2013 5:56:46 AM UTC-5, Tom Potter wrote:
> "Poutnik" <email@example.com> wrote in message news:MPG.firstname.lastname@example.org... > > Absolutely Vertical posted Tue, 02 Apr 2013 09:25:01 -0500 > >> >> > I know how to create an ORTHOGONAL standard >> > that is accurate to 1x10^10 or better, >> > >> >> why do you think such a standard is required? > > I suppose it would be very challenging > wrt material, thermal and mechanical stability. > > Regarding wavelength multiples as Will mentioned.... > > If Tom wants 10^10 precision ( accuracy is different story ), > the requirement is roughly > 1m versus 0.1 nm - 1 small atom, or > near 6 km versus 579 nm of sodium D line. > > Or multiple of above for multiples of WLs. > > -- > Poutnik Actually you can establish an extremely precise ORTHOGONAL standard for very little money. -- Tom Potter http://the-cloud-machine.tk http://tiny.im/390k
Tom Potter We have to deal with these dysfunctionals from New Mexico!!