Shutter

urn:mrn:iala:dic:2-4-0115

A device comprising opaque strips, usually mounted so that each may be rotated through about 90 degrees on an axis.

All strips rotate simultaneously so as alternately to exhibit or obscure a light.

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

English

ampere

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM