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An instrument for recording automatically the variations of atmospheric pressure.
One who, or that which, grates; especially, an instrument or utensil with a rough, indented surface, for rubbing off small particles of any substance; as a grater for nutmegs.
An absolute instrument is an instrument whose calibration can be determined by means of physical measurements.
Which type of instrument are you referring to, musical instrument or tool instrument? If you mean musical instrument, it was David playing a harp. During our first father Adam's 930 years, the bible said that he was witness to the forging of iron and copper.
The instrument you are looking for is a compass