Solar power is tapped directly from the sun; which has an intensity on a clear day of 1,240 W / m^2 on the ground with the sun directly overhead. Many ways of tapping solar power have been developed.
Invented by Horace de Saussure, a Swiss naturalist experimenting as early as 1767, a solar box cooker traps the sun's power in an insulated box; for cooking, pasturization and fruit canning.
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