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In 1890, L.S. Starrett patented a micrometer with other improvements, transforming the rough version of this tool into a modern micrometer. [5] During the same year Starrett began making and refining saw blades, and continues to be a major manufacturer as of 2015. [citation needed] In 1895 Starrett patented the divider with trammel. [6]
The term universal micrometer may also refer to a type of micrometer whose frame has modular components, allowing one micrometer to function as outside mic, depth mic, step mic, etc. (often known by the brand names Mul-T-Anvil and Uni-Mike). Blade micrometers have a matching set of narrow tips (blades).
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]
A caliper using a calibrated screw for measurement, rather than a slide, is called an external micrometer caliper gauge, a micrometer caliper or, more often, simply a micrometer. (Sometimes the term caliper, referring to any other type in this article, is held in contradistinction to micrometer.)
Micrometer can mean: Micrometer (device), used for accurate measurements by means of a calibrated screw; Micrometre, a millionth of a metre
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