Essai d'optique sur la gradation de la lumič.
BOUGUER, PIERRE

Paris Claude Jombert 1729 First edition 8vo. Contemporary calf hinge repaired. Collation: [22] [1] 2-164 [4] p. + 3 folding plates. Binding has raised bands, blank panels with upper having red morocco label and gilt title. This a very clean copy in original binding. Book plate of Adam Ferguson, also known as Ferguson of Raith (20 June 1723 (O.S.) (July 1, N.S.) - 22 February 1816) was a philosopher and historian of the Scottish Enlightenment. He is sometimes called "the father of modern sociology."[1] (Wikepedia) . 8vo. Contemporary calf hinge repaired. Collation: [22] [1] 2-164 [4] p. + 3 folding plates. This a very clean copy in original binding. Very Good Contemporary calf (Item ID: 0000189)

$3,800.00

"Bouguer is regarded as the founder of photometry, the branch of optics concerned with measuring the intensity of light. His two most important contributions to the subject are contained in his Essai, the first part of which states his method of comparing the relative brightness of two lights by using the eye as a null indicator (i.e., to establish the equality of brightness of two adjacent surfaces) and applying the laws of inverse squares. The second part contains the first statement of what is often called Bouguer's law: that in a medium of uniform transparency, the light remaining in a collimated beam is an exponential function of the length of its path in the medium. This law was restated thirty-one years later in Lambert's Photometria and is thus sometimes referred to as Lambert's law. (DSB, Norman, 283). " Book plate of Adam Ferguson, also known as Ferguson of Raith (20 June 1723 (O.S.) (July 1, N.S.) - 22 February 1816) was a philosopher and historian of the Scottish Enlightenment. He is sometimes called "the father of modern sociology."[1] (Wikepedia)

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