Where does “actinograph” come from?
actinograph (English) comes from English graph, from Ancient Greek γράφω, from Proto-Hellenic grəpʰō, from Proto-Indo-European gerbʰ-, from Proto-Indo-European ger- — to turn, bend, twist, wind; to tie, bind...
actinograph (English): A recording actinometer
Definitions
- A recording actinometer