Visual Photometer

2-1-540

A photometer in which equality between a radiation under test and a comparison radiation is established visually.

The methods chiefly employed are luminosity match of two adjacent surfaces, adjustment to equality of contrast, or adjustment to minimum flicker.

Reference: C.I.E. (modified)

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

English