Focal Plane (of a light)

From International Dictionary of Marine Aids to Navigation
Revision as of 10:05, 25 February 2009 by Oferiks (talk | contribs) (1 revision)
Jump to navigation Jump to search

2-2-170

The horizontal plane through the focus of the optical apparatus of the light.

Ch2 Fig10.jpg


Note: In lighthouse practice in some countries the term "focal plane" is used with the above meaning, although this is quite a different meaning from that of 2-2-165.




Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)