In Physics lab, we were measuring the coefficient of expansion of various metals. This was done by inserting a rod into a steam jacket, and when the rod expanded, it would push the end of this metal rod with some kind of spring attachment that would cause a dial to measure the expansion in thousandths of an inch. The lab protocol we were given calls it a micrometer, but it is a different setup than the one we actually did in class, so I would like to make sure before calling it a micrometer in my lab writeup.
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That is usually called a dial gage. Micrometers are usually hand-held instruments used for precision measuring, and the look like a c-clamp.
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That is not a micrometer, it sounds like a run-out gage or something similar.
Link shows some micrometers. (not to be confused with µm, micro meter, but pronounced differently)
Link shows some micrometers. (not to be confused with µm, micro meter, but pronounced differently)
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The entire apparatus would be considered a dilatometer. I'm not sure what the actual gauge itself would be called.