( 9 ) 



Corresponding Degrees in the 

 Fahrenheit and Centigrade 

 Scales. 



IV. Befractive Indices, Dispersive 

 Powers, and Polarizing 

 Angles. 



(1.) Refractive Indices. 



Diamond 



Phosphorus 



Bisulphide of carbon 



Flint glass 



Crown glass 



Rock salt 



Canada balsam 



Linseed oil (sp. gr. ' 932) 



Oil of turpentine (sp. gr. ■ 885) 



Alcohol 



Sea -water 



Pure water 



Air (at 0° C. 



760 mm.) 



(2.) Dispersive Powers. 



Diamond 



Phosphorus 



Bisulphide of carbon 



Flint glass 



Crown glass 



Rock salt 



Canada balsam 



Linseed oil (sp. gr. -932) 



Oil of turpentine (sp. gr. ■ 885) 



Alcohol 



Sea water 



Pure water 



Air 



(3.) Polarizing Angles 



Diamond 



Phosphorus 



Bisulphide of carbon 



Flint glass 



Crown glass 



Rock salt 



Canada balsam 



Linseed oil (sp .gr. -932) 



Oil of turpentine (sp. gr. ■ 886) 



Alcohol 



Sea water 



Pure water 



Air 



