The Notebooks of Leonardo Da Vinci — Complete · Chapter 156To Prove How It Is That Luminous Bodies Appear Larger, at a Distance, Than They Are

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If you place two lighted candles side by side half a braccio apart, and go from them to a distance 200 braccia you will see that by the increased size of each they will appear as a single luminous body with the light of the two flames, one braccio wide.