News. 1  Proctorâs and Paceâs Chapel joined to make one church. 2  Prepare for the unexpected repair bill. 3  Managing your spring allergies.  Health 1  Inspections. âItâs our people that make the differenceâ.  MADSOCIAL: Women of the Frontier returns to Fort 1  Boonesborough. Daniel Boone memorabilia collection  opens.
A micrometer is a measurement device incorporating a calibrated screw used widely for precise measurement of small distances in mechanical engineering and machining as well as most mechanical trades. The first micrometer was developed by Jean Laurent Palmer of Paris in 1848.
This practice persists in the face of official discouragement, perhaps to help disambiguate between the unit of measurement and the micrometer, a measuring device. âºâº Definition: Centimeter A centimetre (American spelling centimeter, symbol cm) is a unit of length that is equal to one hundreth of a metre, the current SI base unit of length. A centimetre is part of a metric system. It is the base unit in the centimetre-gram-second system of units.