230 Transmission of Radiant Heat 



Liquids. (Common thickness 9.21""".) 

 Oil of pink, (slightly yellow,) 

 Naptha, rectified, (colorless,) - 

 Sulphuric ether, (colorless,) 

 Sulphuric acid, pure, (colorless,) - . - 

 Ditto of Nordhausen, (deep brown,) 

 Hydrate of Ammonia, (colorless,) 

 Nitric acid, pure, (colorless,) 

 Absolute alcohol, (colorless,) - - - 

 Hydrate of potassa, (colorless,) - 

 Acetic acid, rectified, (colorless.) - 

 Pyrolignous acid, (light brown,) 

 Solution of alum, (colorless,) 

 Salt water, ------ 



White of Eggs, (yellowish white,) 

 Distilled water, - - - - - 



TABLE II. — Solids. Common thickness 2.62 

 Open screen, _ _ _ _ . 



Rock salt, (diaphanous and colorless,) - 

 Iceland spar, (idem,) - - - 

 Another kind, (idem,) _ - - 



Rock crystal, (idem,) _ _ - 

 Glass, (idem,) _ - - - - 



Rock crystal smoJced, (transparent deep brown,) 20.25 



Brazilian topaz, (diaphanous, colorless,) 



Carbonate of lead, (idem,) - - - 



White agate, (translucent,) - - - 



Sulphate of barytes, (diaphanous, veined,) 



Aqua marine, (idem, bluish,) 



Yellow agate, _ - - _ - 



Borate of soda, (translucent,) 



Tourmaline, (greenish,) - - - 



Adularia, (irregular veined,) 



Sulphate of lime, (colorless,) - - - 



Fluate of lime, (veined,) - - - 



Citric acid, (colorless,) - - - - 



Sardonyx, (translucent,) - - - 

 Carbonate of ammonia, (streaked,) 

 Tartrate of potash and soda, (colorless,) 

 Alum, glacial, (idem,) - _ - . 

 Sulphate of copper, (transparent, deep blue,) 



