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The zero error in the vernier calipers and micrometer screw gauge when the O mark on the main scale is not in line with the pointer.
William Gascoigne invented it in the 17th century.
it helps in grappling the object with spindle
A micrometer (or micrometer screw gauge) measures the volume of a screw.
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A micrometer screw gauge is commonly known as a micrometer. This is a form of calipers used for measuring small dimensions. Screw gauge in extensively used in the engineering field for obtaining precision measurements. The article describes the principle and main parts of a basic micrometer screw gauge.
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The zero error in the vernier calipers and micrometer screw gauge when the O mark on the main scale is not in line with the pointer.
the inventor of micrometer screw gauge is William Gascoigne.
both are used in accurate measuring in a wide range of environments
William Gascoigne invented it in the 17th century.
it helps in grappling the object with spindle
A "depth gauge micrometer" is used by engineers. A depth gauge micrometer is a precision instrument used to measure various depths of different items.
In an Experiment to determine the linear expansion of copper, a micrometer screw gauge is one of the apparatus used, and it's usually fixed at the end of the metal rod. Now the reason why the micrometer screw gauge should always be reset back from the end of the bar is to avoid the heating of the micrometer screw gauge which would expand it,hence giving inaccurate measurements when taking the change in length of the rod. Since the experiment is all about linear expansion,it involves heat also. This heat is the one that would heat the rod and after the heat would be uniformly conducted throughout the bar,it would also heat the micrometer screw gauge at the end. This is the reason why it should be reset back from the end of the rod(to avoid it's heating)
Millimeters, or centimeters.