Röntgen Rays: Memoirs by Röntgen, Stokes, and J. J. Thomson

Front Cover
Harper & brothers, 1899 - Radiography - 75 pages
0 Reviews

What people are saying - Write a review

We haven't found any reviews in the usual places.

Other editions - View all

Common terms and phrases

Popular passages

Page 77 - THE STUDENTS' LYELL A Manual of Elementary Geology. Edited by JOHN W. JUDD, CB, LL.D., FRS, Professor of Geology, and Dean of the Royal College of Science, London. With a Geological Map, and 736 Illustrations in the Text. New, revised edition. Crown 8vo, Cloth, $2 25 ; by mail, $2 39. The progress of geological science during the last quarter of a century has rendered necessary very considerable additions and corrections, and the rewriting of large portions of the book, but I have everywhere striven...
Page 77 - ... or by experiment. Directions are given for the collection of specimens, for their preservation, and for preparing them for examination; also for performing simple physiological experiments.
Page 11 - ... from which the x-rays radiate in all directions. The x-rays proceed from that spot where, according to the data obtained by different investigators, the cathode rays strike the glass wall. If the cathode rays within the discharge-apparatus are deflected by means of a magnet, it is observed that the x-rays proceed from another spot — namely, from that which is the new terminus of the cathode rays.
Page 4 - We soon discover that all bodies are transparent to this agent, though in very different degrees. I proceed to give a few examples: Paper is very transparent; behind a bound book of about one thousand pages I saw the fluorescent screen light up brightly, the printers' ink offering scarcely a noticeable hindrance.
Page 6 - ... if they are protected merely by the usual covering of paste-board and paper. It appears questionable, however, whether the chemical action on the silver salts of the photographic plates is directly caused by the X-rays. It is possible that this action proceeds from the fluorescent light which as noted above, is produced in the glass plate itself or perhaps in the layer of gelatin. "Films"' can be used just as well as glass plates.
Page 77 - Systematic Zoology until the student has mastered those structural affinities upon which true classification is founded ; and in being fitted for High Schools and Mixed Schools by its language and illustrations, yet going far enough to constitute a complete grammar of the science for the undergraduate course of any college. INTRODUCTION TO ELEMENTARY PRACTICAL BIOLOGY A Laboratory Guide for High Schools and College Students. By CHARLES WRIGHT DODGE, MS, Professor of Biology, University of Rochester.
Page 8 - From what has now been said it is obvious that the X-rays cannot be concentrated by lenses; neither a large lens of hard rubber nor a glass lens having any influence upon them. The shadow-picture of a round rod is darker in the middle than at the edge...
Page 10 - Other substances behave in general like air; they are more transparent to X-rays than to cathode rays. (11) A further difference, and a most important one, between the behavior of cathode rays and of X-rays lies in the fact that I have not succeeded, in spite of many attempts, in obtaining a deflection of the X-rays by a magnet, even in very intense fields. The possibility of deflection by a magnet has, up to the present time, served as a characteristic property of the cathode rays, although it was...
Page 13 - ... relationship between the new rays and light rays; at least this is indicated by the formation of shadows, the fluorescence and the chemical action produced by them both. Now, we have known for a long time that there can be in the ether longitudinal vibrations besides the transverse light- vibrations; and, according to the views of different physicists, these vibrations must exist. Their existence, it is true, has not been proved up to the present, and consequently their properties have not been...
Page 46 - ... to light, might be transparent to them. So, as I say, that remarkable property, if it stood alone, would not necessarily constitute any great difference of nature between them and ordinary light. But there are other properties which are far more difficult to reconcile with the idea that the Rontgen rays are of the nature of light. There is the absence, or almost complete absence, of refraction and reflection. Another remarkable property of these rays is the extreme sharpness of the shadows which...

Bibliographic information