eyepiece micrometer
noun
A scale of measurement inside an eyepiece that can be viewed at the same time as the image, on which it appears superimposed; an eyepiece incorporating such a scale.
Origin
Early 19th century; earliest use found in David Brewster (1781–1868), natural philosopher and academic administrator.
- water purification
- water purslane
- water-quake
- water race
- water rail
- water ram
- water rat
- water rate
- water rattle
- water rattler
- water rent
- water-repellancy
- water-repellant
- water-repellence
- water-repellency
- water-repellent
- water-repelling
- water-resistance
- water-resistant
- water resource
- water ret
- water-retentive
- water retting
- water rice
- water right