Engraving depicting the explanation by Caspar Schott of how he thought the Egyptian priest used the principle of the camera obscura to display miraculous messages. A metal mirror with an inverted legend was placed in the sunlight (left) outside the temple at the correct distance so that light from it would pass through a hole and be thrown on the wall above the altar, giving an upright image. Caspar Schott (1608-1666) a Jesuit, scientific author and educator of the Baroque period. Dated 19th Century

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Engraving depicting the explanation by Caspar Schott of how he thought the Egyptian priest used the principle of the camera obscura to display miraculous messages. A metal mirror with an inverted legend was placed in the sunlight (left) outside the temple at the correct distance so that light from it would pass through a hole and be thrown on the wall above the altar, giving an upright image. Caspar Schott (1608-1666) a Jesuit, scientific author and educator of the Baroque period. Dated 19th Century

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