104 On a Repetition o/Dr. Kerr's Magneto-optic Experiment, 



Angle, 



Angle, 



Angle, 



Angle, 



Angle, 



Radius, 



1st curve. 



2nd curve. 



3rd curve. 



4th curve. 5th curve. 



in inches. 



O 1 



45 



98 ' 



135 ' 



180 



225 



4-318 



45 15 



90 30 



135 45 



181 



226 15 



4276 



45 30 



91 



136 30 



182 



227 30 



4-234 



45 45 



91 30 



137 15 



183 



228 45 



4- 193 



4fi 



92 



138 



184 



230 



4152 



46 15 



92 30 



138 45 



185 



231 15 



4-112 



56 30 



93 



139 30 



186 



232 30 



4-072 



46 45 



93 30 



140 15 



187 



233 45 



4-033 



47 



94 



141 



188 



235 



3-994 



A7 15 



94 30 



141 45 



189 



236 15 



3-955 



47 30 



95 



142 30 



190 



237 30 



3-917 



47 45 



95 30 



143 15 



191 



238 45 



3 879 



48 



96 



144 



192 



240 



3841 



48 15 



96 30 



144 45 



193 



341 15 



3-804 



48 30 



97 



145 30 



194 



242 30 



3-767 i 



48 45 



97 30 



146 15 



195 



243 45 



3-730 



49 



98 



147 



196 



245 



3-694 



49 15 



98 30 



147 45 



197 



246 15 



3-658 



49 30 



99 



148 30 



198 



247 30 



3-622 



49 45 



99 30 



149 15 



199 



248 45 



3-587 



50 



100 



150 



200 



250 



3-552 



50 15 



100 30 



150 45 



201 



251 15 



3-517 



50 30 



101 



151 30 



202 



252 30 



3-483 



50 45 



101 30 



152 15 



203 



253 45 



3-449 



51 



102 



153 



204 



255 



3-415 



51 15 



102 30 



153 45 



2(^5 



256 15 



3382 



51 30 



103 



154 30 



206 



257 30 



3-349 



51 45 



103 30 



155 15 



207 



258 45 



3-316 



52 



104 



156 



208 



260 



3-284 



52 15 



104 30 



156 45 



209 



261 15 



3-252 



52 30 



105 



157 30 



210 



262 30 



3220 



52 45 



105 30 



158 15 



211 



263 45 



3 189 



53 



106 



159 



212 



265 



3158 



53 15 



106 30 



159 45 



213 



266 15 



3-127 



53 30 



107 



160 30 



214 



267 30 



3-097 i 



53 45 



107 30 



161 15 



215 



268 45 



3 068 



54 



108 



162 



216 



270 



3039 



176 Haverstock Hill, London. 



XIII. On a Repetition of Dr. Kerr's Magneto-optic Expe- 

 riment. 



To the Editors of the Philosophical Magazine and Journal. 



Gentlemen, 



ON reading the very remarkable paper by Dr. Kerr, " On 

 Eotation of the Plane of Polarization by Reflection from 

 the Pole of a Magnet," in the Philosophical Magazine for May 

 1877, it occurred to me that by the aid of some apparatus 

 which T had by me I might be able to reproduce the pheno- 

 mena on a somewhat larger scale than in the original experi- 



