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• 17:40, 3 July 2025 Kkmurray talk contribs created page Aston 1922/Chapter 5 (Created page with "===30. Limitations of the parabola method=== The parabola method of analysis of positive rays described in Chapter III, though almost ideal for a general survey of masses and velocities, has objections as a method of precision, many rays are lost by colUsion in the narrow canal-ray tube ; the mean pressure in which must be at least half that in the discharge-bulb ; very fine tubes silt up by disintegration un...")