The modern vernier caliper, which reads to thousandths of an inch, was invented by American Joseph R Brown in 1851. It was the first precision measurement tool that was priced reasonably enough for most machinists. The ability to make precise measurements was instrumental in producing modern interchangeable parts.
"Discuss the parts of a vernier caliper.
Explain how to read a vernier caliper.
Explain how to take inside and outside measurements using a vernier caliper.
Describe the methods used to maintain a vernier caliper."
Vernier Calipers - Registered Continuing Education Program RCEP
You will not be required to pass the knowledge check questions to move on to the next lesson. These will not be counted as a grade, but each question gives you insight into what you should have learned and the sorts of things you'll need to remember moving forward.
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