Übersetzen...
Automatische Übersetzung:
An engraving depicting a demonstration of how white light is broken down into the spectrum and can be reconstructed into white light. Pencil of sunlight (left) passed through the prism and was thrown into a double convex lens with a card at the focus to observe spectrum. When the card is removed and the point the white light is displayed on the screen (right). Dated 19th century