An a.c. generator which generates an a.c. output voltage whose amplitude and frequency are proportional to the speed. It may have either a permanent magnet or a d.c. field winding.
Reference: I.E.C. (modified)
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
Celsius (previously Centigrade)
International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM