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absolute ranges adjustment alloys ampere balance anode approximately B.A. unit balancing mass cadmium cells cadmium sulphate calculated cent centims circuit Clark cell coefficient commutator compared concentration constant cooling-curves crystals current weigher days of largest derived differential determined difference differential curve disturbed days diurnal inequality effect electric electrochemical equivalent electrodynamometer electrolyte eutectic experiments F. E. Smith filter fixed coils fixed cylinders force galvanometer given grammes heat helices helix inch insulation kathode leads liquid Lord Rayleigh magnetic manganin measurements mercurous sulphate mercury mercury standards method microhenries milligrammes per coulomb millim mutual induction National Physical Laboratory nitric acid normal observations obtained ordinary days plane plate potentiometer pressure probable error quiet days rate of cooling Rayleigh form recalescence resistance rest-point secondary sensitiveness set of coils silver nitrate solution sunspot area sunspot frequency sunspot maximum suspended coils suspended cylinder Table temperature tube wire