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This instrument manufactured to meet the specification of the national metrological weather service measurers the duration of bright sunshine. The sun's rays are focused by a glass sphere to an intense spot, which as the sun moves across the sky burns a trace in a card the length of which is proportional to the duration of sunshine the card is held in grooves in a bowl of spherical section mounted concentrically with the sphere.
The sphere made of well annealed colorless optical glass is ground to the highest precision. The bowl is carefully machined from gunmetal and the concentrically of the sphere