100 



JAMIN ON METALLIC REFLEXION'. 



Experiments of Sir David Brewster on Silver. 

 Incidence, 80° on the first surface. 



Differences of Complement of incidences which 

 Angle of the phase of the | ^^^1"'"' ''y.» ^f "",'1 reflexion, 

 two planes of principal rays the rectihneal polaruation. 

 incidence. to the second ' 



incidence. Observed. Calculated 



+90 00 

 78 45 

 67 30 

 56 15 

 45 00 

 33 45 

 22 30 

 11 15 

 00 

 -11 15 

 -22 30 

 33 45 

 45 00 

 56 15 

 67 30 

 78 45 



yo GO 



54 19 

 57 51 

 66 26 

 n 56 

 96 7 

 no 40 

 120 30 

 125 25 

 125 41 

 122 90 

 113 34 

 100 4 

 83 53 

 69 19 

 59 30 

 54 35 

 54 19 



10 00 



10 00 



11 32 

 14 20 

 18 20 

 21 13 



25 20 



26 55 

 28 2 

 24 40 

 21 00 

 16 40 

 14 35 

 11 10 

 10 00 

 10 00 

 10 00 



9 24 

 9 53 



11 37 



14 33 



18 37 

 23 1 

 26 32 

 28 29 

 28 37 

 26 30 

 23 59 



19 44 



15 28 



12 12 

 II 13 



9 15 

 9 24 



+0 36 

 +0 7 

 -0 05 

 -0 13 

 -0 17 

 -1 48 

 -1 12 

 -1 34 

 -0 35 

 -1 50 

 -2 59 

 -3 4 

 -0 53 

 -1 2 

 -1 13 

 +0 45 

 +0 36 



Incidence, 68° on the first surface. 



13 00 



14 00 



15 15 



16 00 



17 00 



19 00 



20 00 

 20 00 

 20 00 



18 00 

 16 30 

 15 30 

 14 30 

 14 00 

 13 30 

 13 00 

 13 00 



12 42 



13 24 



14 41 



15 58 



18 27 



20 25 



21 42 



22 00 

 22 15 

 21 14 



19 30 

 17 32 

 15 38 

 14 00 

 13 2 

 12 37 

 12 42 



+0 18 

 +0 36 

 +0 34 

 +0 02 

 -1 27 

 -1 25 

 -1 42 

 -2 00 

 -2 15 

 -3 14 

 -3 00 

 -2 2 

 -1 8 



+0 28 

 +0 23 

 + 18 



I have proposed to myself, in this memoir, not only to make 

 known the experiments which belong to myself in particular, 

 but also to recapitulate those due to experimenters who have 

 preceded me in these researches, and to show that, thanks to 

 the mathematical investigations of M. Cauchy, the question of 

 metallic reflexion is at the present time completely settled. 

 There remain yet numerous experimental researches to be made, 



