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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).
Three outside calipers. Outside calipers are used to measure the external size of an object. The same observations and technique apply to this type of caliper, as for the inside caliper. With some understanding of their limitations and usage, these instruments can provide a high degree of accuracy and repeatability.
Micrometer can mean: Micrometer (device), used for accurate measurements by means of a calibrated screw; Micrometre, a millionth of a metre
Though some earlier 19th century tools were called combination squares, the modern combination square was invented in the late 1870s by American inventor Laroy S. Starrett, and patented in 1879. [note 1] [8] In 1880 he founded the L. S. Starrett Company in Athol, Massachusetts, United States. The tool was originally designed for machinists, but ...
One common single lever test indicator was the Starrett (No. 64), and those using systems of levers for amplification were made by companies such as Starrett (No. 564) [2] and Lufkin (No. 199A), [3] as well as smaller companies like Ideal Tool Co. Devices that could be used as either a lever test indicator or a plunger type were also ...
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