Sunshine Recorder

The Sunshine Recorder is an instrument for accurate measurement of the duration of bright Sunshine at a place. Even though, there are various other types of instruments available for this purpose, Campbell-stokes type is preferred as an interim reference recorder, and used extensively by all countries.

The sun's rays are focussed by a glass sphere to intense spot which, as the sun moves across the sky, burns a trace of length proportional to the duration of sunshine on a special card. The card is inserted into grooves in a bowl of spherical section mounted concentrically with the sphere.

The sphere made of well-annealed colorless optical glass, is securely clamped to semi-circular metal arc by means of two caps attached precisely across a diameter. The bowl, machined from a hollow sphere, in the form of a belt, is also mounted on a marble base. The concentricity is ensured by a sphere centering gauge. Three overlapping pairs of grooves in the bowl accept recording cards suitable for summer, equinoctial and winter seasons.

Adjustment for Latitude Dimensions	5° to 45° N or S or 0° to 65° N or S
Dimensions (cms)	24 x 19 x 17cms or 240 x 187 x 165mm approx
Weight (kg)	4.3 to 4.5
Sphere Dia (mm.)	101.6 + 1.3
Focal length for Sodium D light (mm)	74.9 + 0.25

Complete supplied with set of chart for 1 Year use.

Set of Chart for 1 Year use

Spare Glass sphere with mount

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