...of sodium, which, according to the mechanical explanation thus suggested, being particularly opake for light of that quality, prevents such of it as...surrounding atmosphere. The test of this theory must be bad in ascertaining whether or not vapour of sodium has the special absorbing power anticipated. I...

...possess by its molecular structure a tendency to vibrate in the periods corresponding to the degree of refrangibility of the double line D. Hence the...must be had in ascertaining whether or not vapour of 1 ) Monatsberichte der K. .Mail, der Wissenich. zu Berlin, Oct. 1809. sodium has the special absorbing...

...refrangibilit y of the double line D. Hence the presence of sodium in a source of light, must tend lo originate light of that quality. On the other hand...must be had in ascertaining whether or not vapour of 1) Monatsberichte der K. Vk.nl. der Wissenich, tu Berlin, Oct. 1859. sodium has the special absorbing...

...suggested, being particularly opaque for light of that quality, prevenls such of it äs is emittedfrom the sun from penetrating to any considerable distance through the surrounding atmosphere. The lest ofthis theory must bc had in ascertaining tvheiher or not vapour of 1) Monatsberichte der K. Akad....

...the atmosphe1e around the sun, therefore, there must be present vapour of sodium, which, according to mechanical explanation thus suggested, being particularly...sodium has the special absorbing power anticipated.' " In the same connection must also be considered the experiments on the properties of radiant light...

...the atmospheie around the sun, therefore, there must be present vapour of sodium, which, according to mechanical explanation thus suggested, being particularly...sodium has the special absorbing power anticipated.' " In the same connection must also be considered the experiments on the properties of radiant light...

...the atmosphere around the sun, therefore, there must be present vapor of sodium, which, according to mechanical explanation thus suggested, being particularly...theory must be had in ascertaining whether or not vapor of sodium has the special absorbing power anticipated.' " In the same connection must also be...

...possess by its molecular structure a tendency to vibrate in the periods corresponding to the degree of refrangibility of the double line D. Hence the...penetrating to any considerable distance through the surrunding atmosphere. The test of this theory must be had in ascertaining whether or not vapour of...

...explanation thus suggested, being particularly opaque for light of that quality, prevents such of it äs is emitted from the sun from penetrating to any considerable distance through the surrunding atmosphere. The test of this theory must be had in ascertaining whether or not vapour of...

...temperature raised by, light from the source of the precise quality in question. In the atmosphere round the sun, therefore, there must be present vapour of...in ascertaining whether or not vapour of sodium has this special absorbing power anticipated.' Sir W. Thomson continues: ' I have the impression some Frenchman...