It is a sunshine recorder consists
essentially a glass sphere mounted concentrically in a section of a spherical bowl.
Sun's rays are focused sharply on a card held in grooves in the bowl for measuring
sunshine duration. |
It is a sunshine recorder consists
essentially a glass sphere mounted concentrically in a section of a spherical bowl.
Sun's rays are focused sharply on a card held in grooves in the bowl for measuring
sunshine duration. |