1884.] Some Experiments on Metallic Reflection. 191 



Table III. — Steel, with. Light polarised in the plane of Incidence. 



Angle of 

 Incidence. 



A. 



B. 



C. 



D. 



Mean. 



o 



57 "01 



fil -67 



Ol u / 



fis -nfi 







fil • 



fin '*70 



40 



61 '73 



64 "04 



fift -1 8 





oy< ^1 



50 



65 31 



67-41 



71-97 



69-41 



68-52 



55 



68-76 



70 -41 









60 



70 -88 . 



74-55 



77-96 



74 -31 



74 -42 



65 



77 -22 ' 



76-02 



81 -40 



74-83 



77 -37 



70 



81-48 



80-77 



85 -22 



81 -57 



82-26 



75 



84 -09 



84-92 



90-32 



84-71 



86 -01 



80 



84-58 



86-34 



91-55 



89-01 



87 '87 



Table IY. — Steel, with Light polarised perpendicularly to the Plane 



of Incidence. 



Angle of 

 Incidence. 



A. 



B. 



C. 



D. 



Mean. 



30 



49-27 



50-53 



53 -67 



47-28 



50-19 



40 



45-53 



45-39 



49-79 



44-40 



46-28 



50 



40-45 



41 -24 



43-47 



38 -78 



40-98 



55 



37 47 



37 -34 









60 



35-54 



33 -79 



36-90 



32 -89 



34-78 



65 



29-57 



28-88 



31-97 



29-70 



30-03 



70 



25-69 



26-61 



27-72 



26-14 



26-54 



75 



23-71 



25-55 



25 -38 



24-30 



24 73 



80 



26-29 



26 -46 



27 -60 



26-04 



26 -60 



Similar measurements were made with the speculum metal mirror, 

 and the results are given in Tables V and VI. 



Table V. — Speculum Metal, with Light polarised in the Plane of 



Incidence. 



Angle of 

 Incidence. 



A. 



■ 



C. 



D. 



Mean. 



o 



30 



64-58 



64 -09 



63 -37 



66-18 



64-55 



40 



67 -76 



68-22 



65 -14 



69 -86 



67-74 



50 



72-65 



72-23 



69 -04 



71-90 



71 -45 



60 



76-63 



78-65 



77-57 



77-95 



77 -70 



65 



79 -65 



79-68 



79-44 



81-26 



80-01 



70 



83 -09 



81-25 



84-94 



83-90 



83 -29 



75 



82 -94 



84 -20 



86-93 



88 -01 



85-52 



80 



87-52 



86 -78 



90-96 



89-72 



88-74 



