[time-nuts] OT Prototype Boards

[J. Forster]

Magnus,

There WERE (past tense) a number of definitions of the inch, ranging from
lines on bars of PtIr to a string of grain kernels.

Now there IS (present tense) one, defined as 2.54 cm.

-John

================


> John,
>
> On 06/25/2013 07:52 PM, J. Forster wrote:
>> No. It's THE definition...  there is only one.
>>
>> It's not like Pi, which equals 3 for small circles.
>
> Inches comes in many lengths, these are just a little over 2 ppm apart
> from each other.
>
> In 1893 the Mendenhall Order had the US shift from from using british
> definitions to metric definitions the rule, those making the 1866 metric
> act only the translation table to the now derivate unit of US Inch, as
> opposed to the later defined international inch.
>
> What a mess, what a mess.
>
> Cheers,
> Magnus
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