346 On the Rotation of the Plane of Polarization of Heat, &c. 
By means of a commutator the electric current could be made 
to pass, now in one direction, now in another, through the wires 
of the electric magnet. We shall deSigriate the two currents by . 
the abridged expressions Current A, Current B 
The following are the deviations observed :— 
Experiments of September 22. 
(A Muncke’s battery of 50 elements with large surfaces, but al- 
ready worn, was employed. ) 
FIRST SERIES. 
Deviations. 
Current A, . 21:0 
Without current, ; Se Piping. Boge 
Current A, ‘ : : : 21:4 
Without current, , . ‘ s 18:6 
SECOND SERIES. 
eine was added. bb 
Without current, : 20°5— 
Without current, . Pee, . 20-6" ° 
Current B, ; i ; : : 186 ‘ 
Without current, : ; : ; 209 } 
Current A, ; : ; ‘ . 23°6 
Current B, , ‘ , ‘ ‘ 18:8 
Current A, 22-0 
Current B, : i : ‘ ? 18:0 
Without current, i i é ; 19-9 
THIRD SERIES. 
Current B, ; : ; ; 17-4 
Current B, : ‘ : ; : 17:1 
Current A, ' ‘ : ‘ ‘ 19°5 
Without current, 18:3 
Wise tulene of sevetiter'® 29, 
(A Bunsen’s battery of 30 elements, well-cleaned and | amalgam 
ted, was employed.) 
FIRST SERIES. 
Deviations. 
Without current, : ‘ : ‘ 12-0. 
Current. A, ; : ‘: ‘ - 14:9 
Current B, ‘ ‘ ; : ; 86 
Pros current, ‘ . phe Wd 117 
urrent ; 885% 
Se 
Whboat current, meets ta solbead 118 
