Light Visible and Invisible: A Series of Lectures Delivered at the Royal Institution of Great Britain, at Christmas, 1896 |
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air film aluminium analyser angle apparatus ball beam blue blue-violet centre colours crystal curvature curved dark field direction disk effect electric waves electroscope emitted experiment film fluorescence focus front galvanometer give glass green heat heat-waves Hertz inch infra-red interposed invisible invisible waves kathode rays kind of light lantern lecture lens lenses light-waves luminescent magnet medium metal millionths mirror Newton's rings Nicol prism oblique opaque optical orange ordinary light oscillator paint paper pass phosphorescence photographic piece plane plate polariscope polarised light produce Professor propagation properties quartz radiation red waves reflected reflexion refraction ripples Röntgen light Röntgen rays screen sensitive shadow sheet shines simply slice sparks spectrum substances surface theory thermopile thick thin tint tions tourmaline transparent transverse wave tube ultra-violet light uranium uranium glass velocity vertical vibrations violet visible light wave-front wave-length waves of light white light yellow
Popular passages
Page 183 - This velocity is so nearly that of light, that it seems we have strong reason to conclude that light itself (including radiant heat, and other radiations if any) is an electromagnetic disturbance in the form of waves propagated through the electromagnetic field according to electromagnetic laws.
Page 235 - The first volume, intended for beginners, affords explicit directions adapted to a modern laboratory, together with demonstrations and elementary statements of principles. It is assumed that the student possesses some knowledge of analytical geometry and of the calculus. In the second volume more is left to the individual effort and to the maturer intelligence of the practicant. A...
Page 235 - A Laboratory Manual OF Physics and Applied Electricity. ARRANGED AND EDITED BY EDWARD L. NICHOLS, Professor of Physics in Cornell UniversIty. IN TWO VOLUMES. Vol. I. JUNIOR COURSE IN GENERAL PHYSICS. BY ERNEST MERRITT and FREDERICK J. ROGERS. Cloth.
Page 235 - Certain parts of physics contain real and unavoidable difficulties. These have not been slurred over, nor have those portions of the subject which contain them been omitted. It has been thought more serviceable to the student and to the teacher who may have occasion to use the book to face such difficulties frankly, reducing the statements involving them to the simplest form which is compatible with accuracy. In a word, the Elements of Physics is a book which has been written for use in such institutions...
Page 183 - The conception of the propagation of transverse magnetic disturbances to the exclusion of normal ones is distinctly set forth by Professor Faraday in his "Thoughts on Ray Vibrations." The electromagnetic theory of light, as proposed by him is the same in substance as that which I have begun to develop in this paper, except that in 1846 there were no data to calculate the velocity of propagation.
Page 183 - Whatever the view adopted respecting them may be, we can, at all events, affect these lines of force in a manner which may be conceived as partaking of the nature of a shake or lateral vibration. For suppose two bodies, AB, distant from each other and under mutual action, and therefore connected by lines of force, and let us fix our attention upon one resultant of force having an invariable direction as regards space; if one of the bodies move in the least degree right or left, or if its power be...
Page 187 - I was working with a Crookes's tube covered by a shield of black cardboard. A piece of barium platinocyanide paper lay on the bench there. I had been passing a current through the tube, and I noticed a peculiar black line across the paper.
Page 187 - The effect was one which could only be produced, in ordinary parlance, by the passage of light. No light could come from the tube, because the shield which covered it was impervious to any light known, even that of the electric arc." " And what did you think ? " " I did not think; I investigated. I assumed that the effect must have come from the tube, since its character indicated that it could come from nowhere else. I tested it. In a few minutes there was no doubt about it. Rays were coming from...
Page 239 - Keep this book Clean. Do not turn down the leaves. If the book is injured, or if this slip is torn or defaced, a fine will be required.
Page 81 - A:ui. vols. cxli., cxliii., cxliv.) on anomalous dispersion in Fuchsin and other colouring-matters, which show that on either side of an absorption-band there is an abnormal change in the refrangibility (as determined by prismatic deviation) of such a kind that the refraction is increased below (that is, on the red side of) the band and diminished above it. An analogy may be traced here with the repulsion between two periods which frequently occurs in vibrating systems. The effect of a pendulum suspended...