Sunshine recorder

From Glossary of Meteorology

sunshine recorder

An instrument designed to record the duration of sunshine without regard to intensity at a given location.

Sunshine recorders may be classified into two groups according to the method by which the recorder timescale is obtained. In one class of instruments the timescale is obtained from the motion of the sun in the manner of a sundial (
see Campbell–Stokes recorder, Jordan sunshine recorder, Pers sunshine recorder). In the second class of instruments the timescale is supplied by a chronograph (
see Marvin sunshine recorder).
Compare actinometer;
see also heliograph, twilight correction.