Radium And Other Radio Active Substances Polonium Actinium And Thorium With

Cover Radium And Other Radio Active Substances Polonium Actinium And Thorium With
Radium And Other Radio Active Substances Polonium Actinium And Thorium With
William Joseph Hammer
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A piece of apparatus has been devised consisting of a disk with slits near the edge, which is placed near an incandescent lamp, and a selenium cell. If the selenium cell is connected to a tele- phone and battery, and the disk is rapidly revolved, a musical note will be produced in the telephone, the pitch of which will correspond to the speed of the revolving disk.
Mr. Giltay has recently written me suggesting a very pretty experiment in this line, in which a double vaned Crookes' radio- meter
...is placed between a selenium cell and an arc light shielded by an alum cell. The light from the arc lamp causes the radiometer to revolve intermittently, screening the selenium cell and produc- ing a musical note in the telephone attached thereto, the pitch of which is in accordance with the speed of revolution of the radiometer.
I have here to-night two forms of flame telephone trans- mitters, one of which was presented to me by Mr. Ruhmer, and the other I have purchased from Mr. Giltay, which I have mounted as you see it here and as illustrated in Fig.


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