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.
March 2014. A micron is a unit of measure in the metric system equal to 1 millionth of a meter in length (about 39 millionths of an inch). The average cross-section of a human hair is 50 microns. The human eye cannot see anything smaller than 40 microns in size. 50 microns â Diameter of a human hair.