O. N. Rood on Photometric Experiments. ae 
Observations on the amount of light reflected by a glass plate 
silvered by Liebig’s process, the silver side being used. ‘The 
light was reflected at an angle of 45°. 
Distance whet Distance with Distance when Distance with 
mirror was used. free flame. mirror was used. free flame. 
946 1297 936 1286 
949 1301 940 1287 
950 1302 941 1288 
951 1302 942 1288 
952 1304 943 1290 
955 1305 944 1292 
956 1306 946 1292 
957 1308 946 1293 
958 1309 947 1295 
961 1309 948 1296 
961 1310 949 1297 
962 1312 950 1298 
965 1312 952 1298 
966 1315 953 1391 
967 1318 954 1303 
967 — 955 1303 
——— 15)19610 956 1304 
16)15323 958 1305 
1307°3 959 1307 
957-68 105° 960 1307 
Correction 19]- salience 961 1307 
Se ae 1202°3 962 1308 
1148-68 965 1312 
—— 1312 
Result 91-26 per cent reflected. 23)21867 1312 
1315 
950°7 re 
Correction 191° 26)33796 
11417 1299°8. 
Correction 105° 
1194°8 
Result 91°3 per cent reflected. : 
ese figures are taken of course directly from ra 
