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The first caliper with a secondary scale, which contributed extra precision, was invented in 1631 by French mathematician Pierre Vernier (1580–1637). [1] Its use was described in detail in English in Navigatio Britannica (1750) by mathematician and historian John Barrow. [2]
Mitutoyo America Corporation was formed in 1963 and is headquartered in Aurora, Illinois (just outside Chicago).Mitutoyo America offers the full product line of precision measuring tools, instruments and equipment with a distribution network, training and education classes, software development, and service support to provide a comprehensive metrology organization.
Vernier calipers commonly used in industry provide a precision to 0.01 mm (10 micrometres), or one thousandth of an inch. They are available in sizes that can measure up to 1828 mm (72 in). They are available in sizes that can measure up to 1828 mm (72 in).
It is a precision ground cylindrical bar for use in Go/no go gauges or similar applications. Go/no go gauge: an inspection tool used to check a workpiece against its allowed tolerances. Its name derives from its use: the gauge has two tests; the check involves the workpiece having to pass one test (Go) and fail the other (No Go). Grind gage
As the last digit is an "estimated tenth", both 5.780 mm and 5.778 mm are also reasonably acceptable readings but the former cannot be written as 5.78 mm or, by the rules for significant figures, it is then taken to express ten times less precision than the instrument actually has! But note that the nature of the object being measured often ...
The standard or square head has three adjacent flat faces, two of them meet square to one another, and the third face is angled away at 45°. When attached one face is parallel to the rule, one face is perpendicular, and one face is at 45°. The standard head usually incorporates a small spirit level and a small removable scriber. [4]
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