Abstract
New spectrographic observations have been made of the flashes of light appearing in small burning iron particles produced in a grinding wheel. In a dispersion of about 80 Ångström per mm slitless spectra of individual flashes show a great number of Fe I lines as well as molecular bands due to FeO, C2, CN and N2. The region observed is between 5160 and 5870 Å. These observations confirm earlier observations by the writer, that discharge phenomena appear in connection with the splitting of a particle in two or more parts. That is to say, the light emission of a flash is due to a discharge spectrum superimposed on a continuous spectrum due to thermal emission.Possible astrophysical applications are briefly discussed.
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