Intelligence and Miscellaneous Articles, 79 



Intensity of Calorific Reflection under different Incidences. 

 Heat polarized parallel to the plane of incidence. 



Platinum Speculum-metal 



(red rays, n=8). (red rays, n=8'7). 



Angles of Observed Calculated Observed Calculated 



incidence, intensities. intensities. intensities. intensities. 



30 0-65 0-65 0-65 0-67 



50 0-72 0-72 0-74 0'74 



72-30 .. — — 0'87 0-87 



76 0'856 0-88 — — 



Steel Silver 



(total solar heat, n=7'4). (total solar heat, n=20), 



30 0-64 0-63 0-84 0'84 



50 0-69 0-70 0-87 0*88 



70 0-83 0-83 0-936 0'934 



76 0-87 0-87 — — 



80 0-88 0-91 0-954 0-96 



Glass Speculum-metal 



(extreme dark rays, n= 1-7). (extreme dark rays, n=26). 



20 0-074 0-077 — — 



30 0-11 0-093 0-87 0-87 



50 0-168 0-163 — — 



60 — ~ 0-93 0-93 



70 0-375 0-373 0-94 0-95 



Heat polarized perpendicularly to the plane of incidence. 



Platinum Speculum-metal 



(n = 8, ^=-0-19). ; (n=8'7, ^=-0-22). 



Angles of Observed Calculated Observed Calculated 



incidence, intensities. intensities. intensities. intensities. 



30 0-59 0-58 0-62 0-61 



50 0-51 0-51 0-577 0*55 



70 0-43 0-43 — — 



72-30 .. — — 0-42 0-42 



76 0-40 0-40 ■— — 



80 — — 0-45 0-45 



Steel (total solar heat, Silver (total solar heat, 



n = 7-4, -^=-0-11). n=20, Jc=—0'3). 



30 0-57 0-54 0-80 0-80 



50 0-47 0-47 — — 



70 — — 0-81 0-79 



76 0-27 0-26 — _ 



80 0-30 0-30 0-83 0-84 



Glass (extreme dark rays. Speculum-metal (extreme 



7i=\'7, ^=—0-8). darkrays, ?2 = 26, ^= + 1-9). 



20 0-06 0-06 — _ 



30 005 0-05 0-83 0-84 



50 0-027 0-028 — . — 



60 — ~ 0-79 0-80 



70 0-095 0-092 0*76 0-75 



In relation to the experiments made with the total solar radiation, 



