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Published online by Cambridge University Press: 12 April 2016
Up to now a few hundred of spectra of several tens of comets have been obtained at different observatories over the whole world. On the one hand, there are high dispersion spectra photographed with slit spectrographs attached to large telescopes, and on the other, small dispersion spectra obtained by means of objective prisms. These objective prism spectra, showing the principal emission bands only, are known for a considerable number of comets, and its appearance is usually described verbally.