This paper follows up the analysis of relativity theory begun by Margenau and Mould, by including electromagnetic theory which in their treatment was tacitly accepted. It is shown that the experiments on which Margenau and Mould rely to establish the special theory of relativity actually confirm the mutual consistency of the Maxwell-Lorentz electromagnetic theory and the special relativity theory, but throw no light on the validity of the two theories taken jointly. It is further shown that a modification of the (...) rules of correspondence between the mathematical structure of the theories and immediate experience would bring the theories into agreement with an alternative relativity theory based on the Galilean instead of the Lorentz transformation. An experiment is suggested by which the need for such modification can be tested. A proof is then given that the rules of correspondence between the concepts of the special relativity theory (and therefore of current electromagnetic theory) and experience are not self-consistent, so that some modification of current ideas is essential. It is suggested that a generalisation of Maxwell's theory, in terms of Faraday's "ray vibrations" instead of Lorentz's static ether, might provide a satisfactory basis for a relativistic electromagnetic theory. (shrink)

A hundred years ago the science of spectroscopy, though not yet christened, may be said to have attained its majority and to be just entering on its period of full adult development. It was born, of course, with Newton's explanation of the formation of the spectrum, and for many years thereafter little of importance was added to what he had discovered. It was not, in fact, until the nineteenth century that anything of outstanding importance occurred, and then, in 1802, Wollaston (...) substituted a slit for the round hole through which Newton's sunlight passed into his prism, and thereby not only saw for the first time the dark lines in the solar spectrum but also took the first step towards the perfection of the spectroscope on which all later progress depended. The next step was taken by Fraunhofer who, in 1814, examined the spectrum through a telescope instead of letting it fall on a screen. The last essential improvement—the introduction of the collimator to make the light from the slit parallel before it entered the prism—was introduced in 1839 independently by Simms and Swan, so that before our period begins, the complete spectroscope existed, though it was not to be converted into a spectrograph, for photographing spectra, until much later. (shrink)

First published in 1951 to coincide with the British Festival, this book explores the developments in science which had occurred since the Great Exhibition of 1851. Covering the full range of scientific development which had emerged in that time – from fundamental physics to evolution and genetics, and from geology to medical surgery – this accessible collection of essays charts with impressive comprehension and clarity the momentous changes which had occurred in the pursuit of science since the mid-nineteenth century, and (...) ably demonstrates the appropriateness of citing the twentieth century as the advent of the scientific age. A Century of Science will appeal to those interested in the history of science, those wishing to ground their knowledge of specific scientific disciplines in a broader understanding of the subject, and also to the general reader who values scientific progress and the questions it continues to raise. (shrink)

INTRODUCTORY THE MISSING FACTOR IN SCIENCE IT is now more than 300 years since Galileo originated the process in philosophy which, in its maturer form, ...

The Special Theory of Relativity: Based on a short course of lectures delivered in the late 1930s, this short book presents the theory of Special Relativity by formulating a redefinition of the measurement of length, and thus will appeal to students of physics who wish to think through Einstein's thought without the encumbrance of quasi-scientific concepts and language. Relativity: A Very Elementary Exposition: This brief lecture, delivered in October 1921 and published for the first time in 1925, offers an explanation (...) of Einstein's theory of Special Relativity for the non-scientist, giving a general overview that does justice both to the actual physics involved, and the wider implications of this revolutionary discovery of the 20th century. (shrink)

Originally published in 1961, this book originated in the belief that there was an urgent need for a greater association between philosophers and scientists and of both with men of religion. The problem of bringing this association into being is approached from different angles by the two authors, who, while agreeing on the main thesis, differ on many details, and the discussion is largely concerned with an examination of the points of difference. It ranges over the significance of scientific concepts, (...) such as ether, energy, space and time, the place of mathematics in science and of linguistics in philosophy, the nature of scientific thought in relation to the universe as a whole, problems of life, mind, ethics and theology. It also raises questions of importance concerning the present attitudes of organizations dealing with these matters towards their respective concerns. While the main purpose is always kept in view, a certain amount of discursiveness allows for the introduction of incidental matters of interest in themselves as well as in their relation to the central theme. The book has been written for the layman, and the student, while not, by over-simplification, offending the expert and the erudite. (shrink)

Originally published in 1961, this book originated in the belief that there was an urgent need for a greater association between philosophers and scientists and of both with men of religion. The problem of bringing this association into being is approached from different angles by the two authors, who, while agreeing on the main thesis, differ on many details, and the discussion is largely concerned with an examination of the points of difference. It ranges over the significance of scientific concepts, (...) such as ether, energy, space and time, the place of mathematics in science and of linguistics in philosophy, the nature of scientific thought in relation to the universe as a whole, problems of life, mind, ethics and theology. It also raises questions of importance concerning the present attitudes of organizations dealing with these matters towards their respective concerns. While the main purpose is always kept in view, a certain amount of discursiveness allows for the introduction of incidental matters of interest in themselves as well as in their relation to the central theme. The book has been written for the layman, and the student, while not, by over-simplification, offending the expert and the erudite. (shrink)