Two French blokes and a cunning mystery person
I have two Frenchmen to thank for my ability to measure things accurately*.
One is Pierre Vernier, who invented the vernier gauge in 1631.
The other is Jean Laurent Micrometer who invented the micrometer in 1848.
OK, it was Jean Laurent Palmer
These are such neat pieces of kit.
My favourite measuring tool is my digital calliper, which looks much like a vernier gauge, but has a capacitive sensing mechanism.
This capacitive linear encoder seems to consist of a couple of sets of PCB fingers (of unknown tolerance) that move past each other and somehow deliver accuracy to a fraction of a millimetre.
And they measure even when ‘off’, while still lasting of ages on one battery.
Despite much googling, I have failed to find out how this sensing works.
* although not where the inside of bores is concerned, where I am still failing
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