The London, Edinburgh and Dublin Philosophical Magazine and Journal of Science

appear applied assumed atmosphere atomic bands becomes brightness calculated caused cent close compared considerable considered constant containing corresponding curve density depends determined difference direction displacement effect electric electron elements emission energy equal equation error experiments expression fact field force formula frequency fringe give given greater heat Hence hydrogen increase indicated intensity length less light limits lines lower magnetic mass matter means measured method mixture molecules motion nature necessary object observed obtained particles passing Phil placed plane plate positive possible potential practically present pressure probable problem radiation ratio relation relative respectively seen separation shown shows solution space spectrum surface taken temperature theory true tube unit vapour variation velocity visibility volume waves wire zero