Apparatus which enables luminous flux to be determined by a single comparison.
Note 1: The most commonly used form of integrating photometer is the Ulbricht sphere with associated photometric equipment.
Note 2: In Britain, the term Photometric Integrator is also sometimes employed with the same meaning.
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