Sunlight powered Leonardo da Vinci’s proposed mirror furnace.
Leonardo explored the use of many mirrors to concentrate sunlight and generate intense heat. A solar furnace focuses incoming rays onto a small target, raising its temperature far above that of the surrounding air. Leonardo’s work belongs to the early history of concentrated solar energy and reflects his broader interest in optics and applied physics.
The concept was practical in principle but depended on accurate mirror alignment, a clear sky, and a suitable target. It was not a steam-powered furnace and did not use burning fuel as its primary energy source. Concentrating sunlight can produce heat, but the usable output changes with the Sun’s position and weather.
Modern solar furnaces use carefully engineered mirror fields and can reach extremely high temperatures. Leonardo’s proposal was an early conceptual predecessor, not a modern industrial installation with automated tracking.