52 



For time-observations and exchange, sidereal chronometer No. 1491, Negus, 

 always used. The galvanic connections were made by means of a switch-board, the 

 connections of which are given in the following diagram: 



Owonoqraph, 



JSreaJc Circuit 



SWITCH i. Closed when receiving from connected station ; Nos. 2 and 3 open. 

 SWITCH 2. Closed when sending to connected station ; Nos. i and 3 open. 

 SWITCH 3. Local ; throws sounder into local circuit. 



