Ruler calibration

Simon

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If you think your watch is wrong you could check it at Greenwich right? But what if you think your tape measure or rulers out, where would you take it?
 

guydewdney

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the ISO - in france.. paris i believe. They have a meter rod of (?steel?) encased in a vacuum jar, in a humidiy controlled room, at a set controlled temperature.

or if you want to be really accurate - 1,650,763.73 wavelengths of the orange-red emission line in the spectrum of the krypton-86 atom in a vacuum, the 'old 'innacurate' way or the new 'accurate way' is defined as the length of the path travelled by light in vacuum during a time interval of 1/299 792 458 of a second.

assuming light travels at 299,792,458 metres per second...





do i get some sort of geek award :cool: ?
 

pammy

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guydewdney said:
do i get some sort of geek award ?


prob not - but we can call you a "sad b*st*rd" if you like :D
 

GrahamC230K

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I don't know what I worry about more. Simon's question or Guy's ability to give a sensible answer!
 

guydewdney

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engineering degree.... doh'


did you know that a link is a formal measurement? (about 8" iirc) ditto a nail (2 1/4") etc etc...


edit 7.92 inches = 1 link (li)
100 links = 1 chain (ch) = 4 rods = 66 ft.
80 chains = 1 statute mile = 320 rods = 5,280 ft.


nail
an old English unit of length equal to 1/20 ell. Like the ell, the nail was used for measuring cloth; traditionally, it represented the length of the last two joints (including the fingernail) of the middle finger. The nail is equivalent to 1/16 yard, 1/4 span, 2.25 inches, or exactly 5.715 centimeters
 

pammy

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nooooooooooo - pleeze stop :D :D
 

Brian WH

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Blame Simon, he started it. :D :D
 

Benzowner

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If the original question is a serious one, and from some of the replys, I'm not sure :D , for engineering measuring instruments, you can take them to a calibration company, who inturn take their measuring devices to another calibration company and so on, to maintain calibration. :confused:
 

PJH

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Geoff2 said:
If the original question is a serious one, and from some of the replys, I'm not sure :D , for engineering measuring instruments, you can take them to a calibration company, who inturn take their measuring devices to another calibration company and so on, to maintain calibration. :confused:
So you should just be able to measure one ruler against another then, or even against a different section of the same ruler ?
 

se97mlm

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How do you adjust the gain and zero of a ruler?!?

Heat it up and stretch?

Tippex out the old scale and start again!!!! :D
 

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