Selective Radiation From Various Solids (Classic Reprint) - Softcover

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Excerpt from Selective Radiation From Various Solids

The substances used in the present investigation were in the form of solid rods made in an oxy-hydrogen flame, or in the form of thick layers of the substance placed upon a heater. The rods were heated by an electric current from the secondary of a 2000 volt, goo-watt transformer These rods had, of course, to be given an initial heating with an alcohol or blast lamp until they became conducting, just as is necessary with the Nernst glower. A resistance was placed in the primary circuit of the transformer, to regulate the current. The rods were provided with platinum terminals and were securely mounted in incandescent lamp sockets. After heating them until they became conducting they were securely mounted before the spectrometer slit.

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