The unaided human eye can see individual objects as small as a few tens of microns, can detect single photons (when dark-adapted), and can see objects millions of light-years away in space. Our fingertips can feel differences in texture resulting from...

// n. The semantic role borne by an NP which expresses the inanimate means by which something is done, such as the key in Lisa opened the door with the key and The key opened the door. Instrument is one of the deep cases recognized in Case...

1. A tool. 2. Often used in the language of US research to refer to an accepted and validated research tool, such as a questionnaire, attitude inventory, which is utilized in a research process. 3. A musical...

. See ASTRONOMICAL AND NAVIGATIONAL...

An Instrument is a tool, intended for a purpose other than mechanical work, in particular a refined...