OF RADIANT HEAT THROUGH DIFFERENT BODIES. 65 
Transmissions out of 100 rays. 
Names of the substances 
interposed. 
(Those plates whose thickness is 
not specially indicated have the 
common thickness of 2™™-6.) 
the lamp, 
alum, 
(thickness 2™™°6, ) 
sulphate of lime, 
chromate of potash, 
(thickness 2™™-6,) 
green glass 
(thickness 1™-85,) 
black glass, 
(thickness 1™™°85.) 
Rays immediately from 
(thickness 2™™-6,) 
Rays emerging from the 
Rays emerging from the 
Rays emerging from the 
Rays emerging from the 
Rays emerging from the 
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Iceland spar ......... 
Glass (thick. 0™™- Bue 
Glass (thick. 8™™) 
Rock crystal .. sean 
Chromate of potash | cee 
Sulphate of barytes 
White agate .... 
Adularia felspar 
Yellow amber .... 
Black opake mica(thick. comm. 9) 
Yellow agate 
Emerald 
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Common gum 
Sulphate of lime 
Sulphate of lime (thick. Le) 
Carbonate of ammonia 
Citric acid . 
| Tartrate of of potash and soda , 
Alum... Be caon cence 
OOO Ff GHD 
O10 fF DOr $8 
POA e A Doan 
NSONW FOS rm 00 0O 
= 09 
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Doon ooo Ar HaANWTAWMAATO 
SPHNHOANODHPOSTAUADMDWMOWOBDMOHATOCS 
Coloured glasses, 
(common thickness 1™™-85.) 
Glass, white 
— violet 
jh orange 
green ae 
green (mineral) 
Vout. I—Parrt I. EF 
