Flicker Photometer

From International Dictionary of Marine Aids to Navigation
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2-1-555

A visual photometer in which the eye sees an undivided field illuminated alternately by two sources to be compared, the frequency of alternation being conveniently chosen so that it is above the fusion frequency for colours but below the fusion frequency for luminosities.

Reference: C.I.E.




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

Contrast

Celsius (previously Centigrade)

Capacitance

charge current

Intensity

Illuminance

Energy

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