LIGHT. 



Coefficient cf expansion of air (volume constant) .... 

 Coefficient of expansion of air (pressure constant) 



Coefficient of expansion of mercury (0 - 100) ... 

 Coefficient of apparent expansion of mercury in glass 



0001802 



LIGHT. 



(41) "Wave lengths of the chief lines in the spectra of the sun 

 end of the mere volatile metals in ten-millionths of a mm. or 

 10- 10 m. 



THE SOLAR SPECTRUM. 



