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Published online by Cambridge University Press: 15 September 2014
The recent exhibition by Professor G. Forbes of some of the latest of Mr Crookes' experiments, together with what I had read or heard about their explanation, led me to infer that I might determine directly the velocity of the luminous particles near the negative pole (and perhaps at other parts) of a vacuum tube by means of observations of the spectrum made in directions perpendicular to, and parallel to, the lines of motion of the incandescent particles of gas.