"Will Janoschka" <email@example.com> wrote in message news:DmJ5SKFdRQph-pn2-SwywTCeLLoXu@209-142-179-188.dyn.centurytel.net... > On Tue, 2 Apr 2013 14:25:01, Absolutely Vertical > <firstname.lastname@example.org> wrote: >> On 4/2/2013 7:27 AM, Tom Potter wrote: >> > Apparently no one understands my questions. >> > "How would one measure a right angle >> > without using geometry, >> > or the 3-4-5 relationship, >> > and how precisely can a right angle be measured?" >> > Let me put it like this, >> > what **primary standard** do physicists, the military, >> > astronomers , industry, etc. >> > use as their ORTHOGONAL standard, >> > and how accurate are these standards MECHANICALLY? >> > I dare say they trust Euclid and Pathagoras. >> > I suggest that one should "trust BUT verify." >> > I know how to create an ORTHOGONAL standard >> > that is accurate to 1x10^10 or better, >> > Do you? >> >> why do you think such a standard is required? > > His Question is how to measure? > > One must be able to construct more > precise, than "can" be measured, > so that the measurement has all > the error, not the construction. > This is particularly true for a standard!