Sunshine Recorder, For Meteorological, Packaging Type : Wooden Box

The Sunshine Recorder is used for the accurate measurement of the duration of bright sunshine at a place. The Sunshine Recorder consists of a glass sphere mounted concentrically in a section of a spherical bowl. Three overlapping grooves are provided in the bowl to take cards suitable for different seasons of the year. The instruments is mounted on heavy base, The scale of degree of latitude from -5 to 45 Degree. The sphere support with the glass sphere and bowl can be tilted, adjusted and clamped at an angle to suit the latitude of the station. The focused Sun's rays burn a trace on the card to indicate the period of bright sunshine during the day.

Details :

• The glass sphere has a focal length of 74.9 mm and having deviatin of e/- 0.25 mm. The base of the instruments is good quality marble stone,
• The card used in the instrument is made from white pasteboard and has a thickness in between 0.43 mm to 0.48 mm. There are three types of cards used in the instrument, namely Straight, Curved Short and Curved Long. The upper surface of the card is colored to a standard shade of the blue / dark gray colour. TtO instruments is supplied with one year cards.

Sunshine :

• Sunshine is measured using a Campbell  Stokes sunshine  recorder.
• Sunshine is measured in Hours per day.
• Lines on a weather map showing areas of equal sunshine are called Isohels.

Campbell-Stokes sunshine recorder :

• The glass sphere concentrates the rays of the sun and focuses them onto a strip of paper
• The paper is marked off in hourly intervals
• As the sun travels across the sky the rays are pointed towards a different section of the card
• When the sun shines it burns a mark on the paper
• The lengths of the burnt strips are added up to give the total amount of sunshine. In this case the sun shone for 7 hours.

General Description : Sunshine recorder consists of a glass sphere mounted concentrically in a section of spherical bowl, the diameter of which is such that when the instrument is exposed to the sun's rays, they are focused sharply on a card held in grooves in the bowl. Three overlapping pairs of grooves are provided in the bowl cards suitable for different seasons of the year. The sharply focused sun's rays burn a trace on the card which has a time scale printed on it. The length of the burn indicates the period of bright sunshine during the day.
Specifications :

• Material
  
  • Base - Good quality marble or similar stone, black or white
  • Sphere - Uniform and well annealed glass
  • Bowl - Tin bronze
  • Pivot - Brass 9.2.2
• Dimensions  - The instrument shall have the dimensions indicated in figures 9.1 and 9.2.

Sunshine cards  Properties and dimensions of sunshine cards are given in Appendix A of IS: 7243-1974.