Philosophical Magazine

appear applied assumed atmosphere atomic bands becomes brightness calculated caused cent close compared considerable considered constant containing corresponding curve density depend determined difference direction displacement effect electric electron elements emission employed energy equal equation error experimental experiments expression fact field force formula frequency fringe give given greater heat Hence hydrogen increase indicated intensity known latter length less light limits lines lower magnetic mass means measured method mixture molecules motion nature necessary object observed obtained particles passing Phil physical 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