Mitutoyo: The Origin and Evolution of Calipers - PDF and photo

[Jon]

From Mitutoyo: a 60-page PDF entitled The Origin and Evolution of Calipers.

Related - this 19th century engraved Vernier caliper:

[bmackin]

[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.

[Jon]

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.

Two letter L's in caliper is the British spelling. But yes, I'm a fan of "pick one spelling and stick with it."

Considering Mitutoyo's extraordinary reputation, I'm happy to stick this one in the "highly adept technical people who make dumb spelling and grammatical errors" drawer.

[Toolmaker51]

I read the document, finally. Favorite part? Four pages in;

First of all, it is necessary to define what we mean by a caliper. This is because the writer has come across a specification draft of ISO/DIS (International Organisation for Standardisation / Draft of International Standard) 13385-2.2. The title of this draft is Geometric Product Specification (GPS) - Dimensional Measuring Equipment-Part 2: calliper depth gage - Design and metrological requirements.This draft was embarrassingly approved in 2011. The problem is that it uses the term caliper depth gage. However, this specification clearly concerns depth gages alone and so the word caliper is erroneous in this context. It is believed that the specialists who were in charge of compiling ISO/TC213 did not realize the significance of the term caliper so it was decided to address this point in this document.

Glaring example.

Many governing bodies are composed of inadequate resources, not personnel, but qualified personnel. That falls on leadership, rarely shortage of middle management!
Yes, that sums up my observation of ISO. Note generous labeling of 'specialists' interspersed with 'in charge of compiling ISO/TC213 did not realize the significance'...

Ask just about anyone, calliper/ caliper means instrument with measuring faces equally opposed to, or facing each other.

[johncg]

"The Origin and Evolution of Caliper" has a lot of interesting information. Thanks for sharing.