Word: spectrograms
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Dates: during 1932-1932
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...three speeds at which definite vibrations developed. The balls representing the atoms moved over paths of a pattern characteristic for each speed. To the delight of Messrs. Kettering, Andrews & Shutts, the relation of the speeds to one another coincided almost exactly with the relation of vibration lines in the spectrogram of water. Thereupon they built "molecules" of benzene, toluene, carbon tetrachloride and methane and found that they worked almost exactly according to current atomic theory, thereby confirming that theory mechanically and giving instructors beautifully precise tools for classroom exposition...