Chemical Discovery And Invention in the Twentieth Century
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" It consists of a glass tube evacuated as completely as pos- sible by means of a mercury pump, and partially lined with tinfoil con- nected with earth. In the vertical axis of this vessel is suspended, by a quartz rod, a small tube containing a radium salt in metallic connection with a pair of gold leaves attached to the lower end by means of a brass cap. The lower part of the tube containing the radium is smeared with phosphoric acid to render it conducting. While the negative /3-rays are dis...charged into the glass of the tube, the gold leaves gradually acquire a positive charge, which they retain, if the vacuum is good, till they diverge sufficiently to fo earth touch the tinfoil lining of the bulb, when they instantly collapse. They then gradually get recharged, and the operation is repeated at intervals, the frequency of which depends on the amount and activity of the substance connected with the gold leaves. (Philo- sophical Magazine, 1903, p. 588. ) But the radiations of thorium and radium designated a, /3, and y, are accompanied by an active substance which was found to be carried off in a current of air, and which, though it would pass slowly through paper, could be prevented from escaping FIG.
What to read after Chemical Discovery And Invention in the Twentieth Century?
You can find similar books in the "Read Also" column, or choose other free books by William a William Augustus Tilden to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
" It consists of a glass tube evacuated as completely as pos- sible by means of a mercury pump, and partially lined with tinfoil con- nected with earth. In the vertical axis of this vessel is suspended, by a quartz rod, a small tube containing a radium salt in metallic connection with a pair of gold leaves attached to the lower end by means of a brass cap. The lower part of the tube containing the radium is smeared with phosphoric acid to render it conducting. While the negative /3-rays are dis...charged into the glass of the tube, the gold leaves gradually acquire a positive charge, which they retain, if the vacuum is good, till they diverge sufficiently to fo earth touch the tinfoil lining of the bulb, when they instantly collapse. They then gradually get recharged, and the operation is repeated at intervals, the frequency of which depends on the amount and activity of the substance connected with the gold leaves. (Philo- sophical Magazine, 1903, p. 588. ) But the radiations of thorium and radium designated a, /3, and y, are accompanied by an active substance which was found to be carried off in a current of air, and which, though it would pass slowly through paper, could be prevented from escaping FIG.
What to read after Chemical Discovery And Invention in the Twentieth Century?
You can find similar books in the "Read Also" column, or choose other free books by William a William Augustus Tilden to read onlineMoreLess
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