[QUOTE=Jon;122020]From Mitutoyo: a 60-page PDF entitled The Origin and Evolution of Calipers.

This document from Mitutoyo which seems to support the idea of correctly naming tools does very poorly at correctly spelling the names of the tool. They go from 'caliper' to 'calliper' so many times I had to stop reading and just scanned through the rest of the document looking at the pictures.