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Original published in 1926, this book presents a detailed account of quantum theory from its beginnings onwards. The text opens with a historical account of the quantum theory from its inception by Planck, and is followed by a full treatment of the dynamical theory evolved by Bohr and his school during the following ten years to explain the phenomena of line spectra. Some chapters are devoted to a general description of optical and X-ray spectra and their significance in the problem of the atomic structure of the elements. It closes with an account of work on the reaction of the atom to...

George Birtwistle (1877 1929) published The New Quantum Mechanics in 1928. His stated aim was to give a detailed account of work which had brought the relatively new subject of quantum mechanics to the fore in the previous few years. The earlier chapters give a restatement of Alfred Lande's theory of multiplets which reconciles it with the new mechanics which follow. Later chapters present the matrix theory of Heisenberg, the q-number theory of Dirac and the wave mechanics of Schroedinger, and synthesise new theories, statistics and controversies in the work of de Broglie, Bose, Einstein,...

First published in 1927 as the second edition of a 1925 original, this book was intended as a general introduction to the principles of thermodynamics for university students involved in the physical sciences. Birtwistle gives a brief overview of the history of science relating to heat and the conservation of energy as well as practical examples to back up salient points in his explanation of key ideas. This book will be of value to anyone with an interest in the history of science.

Many of the earliest books, particularly those dating back to the 1900s and before, are now extremely scarce and increasingly expensive. We are republishing these classic works in affordable, high quality, modern editions, using the original text and artwork.