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<p>The first part of the paper is devoted to a description of apparatus including the spectrometers, radiometric appliances and rotating sector device; dispersion curves for various prisms of quartz, fluorite, rock-salt and carbon disulphide are also given. The author then proceeds to describe determinations of the emission curve of the acetylene flame under different conditions, including its comparison with incandescent solid substances such as the Nernst glower. He points out the distinction between the action of incandescent small particles and a homogeneous solid radiator, especially as regards absorption effects. Thus an apparent selective action in the deep red is now shown not to be a true emission band, but the result of increased transparency in that region, which persists o
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<br>Subjects: rays and radiation</div>
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