172 Velocity of th Electric Current. 



ma.de by the managers or operatora in charge. I cannot 

 Inn express my thanks to them for the courtesies and 

 facilities afforded us in these experiments. 



When all the arrangements were completed for the ex- 

 periments, the operator at the Observatory requested a 

 certain Length of circuit with a given number of battery 

 elements. As soon as the necessary connections were 

 made, Mr. 'Jones stated the length of circuit; together 

 with the number and position of the Battery elements. 

 The clock was then thrown in circuit and the line was 

 opened and closed at one end, and each one of the three 

 relays were used to record the beats on the chronograph. 

 The same thing was also done by opening and closing at 

 the other end. 



Each complete experiment gave the following results: 



1st. Armature time of relays. 

 2d. Armature time, plus time of transmission. 

 3d. Armature time, plus time oi' transmission in the oppo- 

 site direction. 



For the second experiment, additional length of circuit 

 was secured and the same class of results deduced. 



In this manner, the longest circuit was used which the 

 batteries and instruments were capable of operating. 



The circuits were continuous, without any repeater or 

 relays, except those used at the Albany office and the 

 Observatory. 



As the repeater time varies from 0. 8 03, to more than 

 O.'IO, any results for velocity through them would be 

 greatly impaired, if not entirely vitiated. 



The longesl circuit employed, was 2,400 miles. Intel- 

 ligible signals and clock beats could be sent over it, but 

 owing to trouble on the wire, we were unable to use the 

 results for velocity determinations. 



