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astjp2

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The inch changed by 2 millionths of an inch in 1959? This was to make it exactly 25.4 mm per inch.....so if you have a real accurate indicator, built before 1959, it will be off! Just some trivia. Tim
 
The inch changed by 2 millionths of an inch in 1959? This was to make it exactly 25.4 mm per inch.....so if you have a real accurate indicator, built before 1959, it will be off! Just some trivia. Tim
And so, of course, did the mile. That can be a headache for surveyors in some circumstances. Thus we have the "statute mile" and the "survey mile".
 
Go metric because the nose of the King might go a little bit longer like Pinocchio. L.O.L.
 
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