Abstract
A dimmer-timer device for producing gradual on-off and off-on lighting transitions (twilight simulation) is described. The basic circuitry is a 24-h timer wired to activate a cam-driven potentiometer at preset times to produce artificial twilight transitions. Kavanau (1962a, b, 1969) suggested that laboratory studies of animal activity and rhythmicity should employ artificial twilight. He discovered that sudden on-off lighting elicited erratic wheel running behavior in weasels, chipmunks, and white-footed mice. Graham (Note 1) demonstrated that the activity of the painted
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