extensometer
Sign in to savethumb|upright|A wireline extensometer monitoring slope displacement and transmitting data remotely via radio or Wi-Fi
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thumb|upright|A wireline extensometer monitoring slope displacement and transmitting data remotely via radio or Wi-Fi
An extensometer is a device that is used to measure changes in the length of an object. It is useful for stress-strain measurements and tensile tests. Its name comes from "extension-meter". It was invented by Charles Huston who described it in an article in the Journal of the Franklin Institute in 1879. Huston later gave the rights to Fairbanks & Ewing, a major manufacturer of testing machines and scales.