Word: lead
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Dates: during 1910-1919
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Professor Theodore W. Richards '86 and Mr. Max E. Lambert, who came to America from the Grand Ducal Technical school of Karlsruhe for the purpose of assisting Professor Richards, have recently been studying the atomic weight of lead obtained from radioactive minerals...
...atomic weights. Radium has a atomic weight of 226, but is known to decompose by emanations of helium. Each atom of helium has an atomic weight of 4, so that after five emanations, the substance remaining has an atomic, weight of 206. This substance is down as radium G. Lead is known to have an atomic weight of 207, and should therefore be practically indistinguishable from radium G. This is the theory which has been advanced. There was, however, some doubt as to whether or not this end product was really lead...
...purpose of really determining whether lead from radioactive sources actually had an atomic weight as low as 206, that Professor Richards and Dr. Lambert undertook their experiment. The most notable thing in connection with the investigation, aside from the astonishing results secured, as the hearty co-operation of the chemists of other countries, prominent investigators of England, Germany, Norway, Russia, and Austria all contributing samples of lead from radioactive sources, for investigation...
...experiments were carried out with the greatest thoroughness, especial care being taken to have the materials as pure as possible. The results of the investigation were amazing. It was found that all of the radioactive speciments, obtained from uraninite, carnotite and thorianite, exhibited a lower atomic weight than ordinary lead, as determined under identical conditions, the deficiency in one case amounting to as much as 0.75 of a unit...
...plain that he looks with some favor, at least, on a closer approximation to the English university ideal, with the university in control of the teaching and the small college (within the university) doing much for youth on the cultural and social sides. Like Princeton, following the lead set by Woodrow Wilson, Harvard that of A. Lawrence Lowell, and Amherst that of Alexander Meiklejohn, Yale is beginning to react favorably on the popular demand that in some way culture, scholarship and intellectuality be restored to a dominant place in the American national academic ideal, from which it has been ousted...