photoelectric color comparator
1Microscope — An optical instrument that augments the power of the eye to see small objects. The name microscope was coined by Johannes Faber (1574 1629) who in 1628 borrowed from the Greek to combined micro , small with skopein, to view. Although the first… …
2Observational astronomy — Mayall telescope at Kitt Peak National Observatory Observational astronomy is a division of the astronomical science that is concerned with getting data, in contrast with theoretical astrophysics which is mainly concerned with finding out the… …
