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Dr J R Airey on the Roots of Bessel and Neumann
E Weatherburn on Two Fundamental Problems
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angle appears applied approximately arrangement atoms axis bands becomes bismuth boundary bulb calculated cell charge close components considerable considered constant corresponding crystal curve determined direction discharge disk distance effect electric electrons energy equal equation experiments expression faces fact field force formula function further given gives greater heat hydrogen increase indicated integral intensity ionization ions latter lattice length less light logarithms magnetic maximum means measured mercury metal method mobility molecules necessary negative normal observed obtained parallel Phil plane plate positive possible potential present pressure probably produced radius range ratio rays readings reflected reflexion regarded relative represented shown side similar solution spectrum surface Table taken temperature theory thickness tube unit vapour variation vector velocity vibration volts