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avé 241 244 porticle tepulka uncharget cocrgies t--- ISe- the him by and when From Curie tarded vel following a bombarded knocked to pes lme. uniper the pushing to completion machines of the typ on which MICROCOSM le its atom weight atomi di fragments in the 240 pcion active clements to see what perchance mir that the o electron going pages. Others were still working wi particles. miles a second fo no visible track. prepar artillery. Thcre was a ferment of its rivalries, its ambitions, its ardors. W of 50, XII Physicists rathe break through a locked door? The answ ray vibrant cablegram from England. James Laboratory, had discovered the neutron. ning. e unknown some of the AND MINUS Such vehe- lided with figuring. million own, but it was a cos a by-product of research into cosmic e not yet known, but which tnown.-ATHANASIUS KRCHER theorist began to 6. THE NEUTRON- A PARTICL to try to account f problems of mate familiar streak of chamber in Pasaden before glimpsed by m The discovery of the neutron exemp the science, but also its communism- radiation which continually bombards d 50 on. Cosmic rays are so energetic that of lead, but they are so elusive that it through the behavior of the material and even these "secondaries" could be n chamber. But in 1929 the Russian 1 in photographing their paths in a the chamber was in a magnetic field, ting velocities so great that the magnet ticles. At once it was recognized that i to the mysterious rays. Bigger and quantitative results. And at the Cali- , where for years cosmic rays have been rch, Robert A. Millikan and Carl D. tional equipment. They procured an they set up in its field a cloud chamber is many inches long; and they provided aphic camera. vas installed Dr. Millikan went abroa and it was not long before Anderson kan in Europe the most exciting pho ayman, as one unimpressed newspa ographs appeared as poorly develo of methods and results, the final stric power; it versity of Giessen, and Jean Frédéric sumed that (daughter of the illustrious Pierre and equal to the of Radium, contributed the prelimina of Chadwick that fitted together th phenomena and completed the pictu stones laid by many hands. Bothe an. Aity of light, Fere assumed ment, the discovery of the neutron, therefore in- Prize in Physics in 1935. Bothe and Becker sighted the thiras abundantly the light metal beryllium with tion at all- beryllium gave off radiation of hi Becker concluded that this must e penetrating l, and hence from radium. The Curie-Joliots began similaltrons must be that a lead shield would absorb say electrical or see what would happen, they ir terms of what absorption screen, and were am llustrated ina creased. Later the increase was the next page. rich in hydrogen, and the ra hydrogen atoms into the ior out with speeds of 18,000 mil the beryllium rays were a w nhat was knock- mudged by poor photography," br dged prints were a triumph. They

This book from 1936 has pages that are not separated. I might be the first to read through it. | /r/mildlyinteresting


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Uploaded Mar 10, 2020 at 04:14PM EDT

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