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".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
I knew something was up, and all this time I was blaming my Chinese gage blocks!
Darrell
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
Could the Chinese make gauge blocks before 1959?