First published by Wiley in 1917, it set the standard for the entire field. Maintaining the same convenient layout and Patterson format with the same high standards of quality, here is the first revision of this invaluable work since 1950. With expanded coverage and new terms, it captures the wealth of scientific discoveries made in the last four decades, including the DNA double helix, practical computers and microelectronic devices, plate tectonics and man in space. Once again German and English-speaking scientists and engineers have an up-to-date and authoritative resource for understanding each other′s language.