242 



MEASUREMENT OF CURRENTS. 



tension. The current enters by two very flexible spirals connected 

 with the terminals / and q. 



The damping is rapid, for the induction due to the displacement 

 of the coil is very great. 



The name " syphon recorder " is due to a detail of its construc- 

 tion. The coil acts by a wire ab, and amplifying levers, on a capillary 

 glass tube c, bent in the shape of a syphon, and the shorter branch of 

 which is immersed in a coloured liquid. The liquid, being electrified 



Fig. 165. 



by a small rotating electrical multiplier (195) (mousc'miU), spirts out 

 of the tube against a paper strip which is being paid out in front. 

 The motion of the coil is transmitted to the syphon, and produces a 

 continuous line on the paper, with indentations on the right or left, 

 corresponding to the + or - signs of the current. 



861. Deprez and d'Arsonval* have constructed a galvanometer 



DEPREZ and D'ARSONVAL. Comptes rendus, Vol. xciv., p. 1347. 1882. 



