Refraction (sound) Refraction (sound) Refraction, in acoustics, comparable to the refraction of electromagnetic radiation, is the bending of sound propagation trajectories (rays) in inhomogeneous elastic media (gases, liquids, and solids) in which the wave velocity is a function of spatial coordinates. Bending of acoustic rays in layered inhomogeneous media occurs towards a layer with a smaller sound velocity. This effect is responsible for guided propagation of sound waves over long distances in the ocean and in the atmosphere. In the atmosphere, vertical gradients of wind speed and temperature lead to refraction. The wind speed is usually increasing with height, which leads to
A Changed Man and Other Tales to be sold in October 1913. A Changed Man and Other Tales A Changed Man and Other Tales is a collection of twelve tales written by Thomas Hardy. The collection was originally published in book form in 1913, although all of the tales had been previously published in newspapers or magazines from 1881 to 1900. There are eleven short stories and a novella "The Romantic Adventures of a Milkmaid". At the end of the book there is a map of the imaginary Wessex of Hardy's novels and poems. Six of the stories were published before 1891 and therefore lacked international