Concentrated solar energy igniting an object through a reflective mirror 插畫檔

A detailed historical illustration depicts a large concave mirror mounted on a tripod stand, focusing sunlight onto a small object, causing it to ignite and emit smoke. The diagram visually explains the scientific principle of concentrated solar energy, with labeled rays showing the path of light from the sun to the focal point. The scene is rendered in a precise, engraved style typical of 19th-century scientific publications, emphasizing clarity and educational purpose over artistic embellishment. Historical illustration reproduced from a publication from France.