The Notebooks of Leonardo Da Vinci

Contents:
Author: Leonardo da Vinci

301.

Experience shows us that the air must have darkness beyond it and yet it appears blue. If you produce a small quantity of smoke from dry wood and the rays of the sun fall on this smoke, and if you then place behind the smoke a piece of black velvet on which the sun does not shine, you will see that all the smoke which is between the eye and the black stuff will appear of a beautiful blue colour. And if instead of the velvet you place a white cloth smoke, that is too thick smoke, hinders, and too thin smoke does not produce, the perfection of this blue colour. Hence a moderate amount of smoke produces the finest blue. Water violently ejected in a fine spray and in a dark chamber where the sun beams are admitted produces these blue rays and the more vividly if it is distilled water, and thin smoke looks blue. This I mention in order to show that the blueness of the atmosphere is caused by the darkness beyond it, and these instances are given for those who cannot confirm my experience on Monboso.

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Chicago: Leonardo da Vinci, "301.," The Notebooks of Leonardo Da Vinci, trans. Richter, Jean Paul, 1847-1937 in The Notebooks of Leonardo Da Vinci (New York: Dover Publications, Inc., 1970), Original Sources, accessed August 7, 2022, http://www.originalsources.com/Document.aspx?DocID=5ACRLXDEVIFA1TS.

MLA: Vinci, Leonardo da. "301." The Notebooks of Leonardo Da Vinci, translted by Richter, Jean Paul, 1847-1937, in The Notebooks of Leonardo Da Vinci, New York, Dover Publications, Inc., 1970, Original Sources. 7 Aug. 2022. http://www.originalsources.com/Document.aspx?DocID=5ACRLXDEVIFA1TS.

Harvard: Vinci, LD, '301.' in The Notebooks of Leonardo Da Vinci, trans. . cited in 1970, The Notebooks of Leonardo Da Vinci, Dover Publications, Inc., New York. Original Sources, retrieved 7 August 2022, from http://www.originalsources.com/Document.aspx?DocID=5ACRLXDEVIFA1TS.