50 



ELECTRICAL MEASUREMENTS 



The dimensions of the apparatus which are given below have 

 been found satisfactory. 



In the arrangement there are two non-magnetic rings 13 in. in 

 diameter, 1 in. wide and % in. thick. These rings slide on three 

 brass rods, % in. in diameter and 30 in. long, and can be clamped 

 by set screws at any desired position. Between the rings is a 

 movable platform to which the galvanometer can be firmly 

 attached. 



FIG. 19. Julius suspension. 



The arrangement is hung by three parallel steel wires, about 

 No. 18 B. & S. gage, from a three-armed support, attached by 

 a single lag screw to a bracket. The points of attachment of the 

 three wires are stout hooks fastened to the brass rods so that the 

 neck of the hook is 12% in. from the upper end of the rod. At- 

 tached to the hooks are damping vanes 3 by 4 in., dipped in jars 

 filled with oil; the centers of these vanes are at the height of 

 the necks of the hooks. Above the upper rings are three iron 

 weights of 6 Ib. each, which slide on the rods and can be clamped 



\ PROPERTY OF ELECTRICAL LABORATORY, ; 



FACULTY OF APPLIED SCIENCE. 



/ 



