Klotz. — Transpacific Longitudes. 65 



from Doubtless Bay, the observaton- battery of 120 cells was 

 cut off, battery being applied to the sending end. At every 

 break of the current at Doubtless Bay the Siemens relay tongue 

 moved to close the circuit and the breaks were recorded by the 

 front style, marks being made at the same time by the obser- 

 vatory clock with the other style. Arbitraries were received 

 from Doubtless Bay in the same way. When arbitraries were 

 being sent from the observator}' it was arranged, by means of a 

 two-way switch, to cut off the clock from one Post Office relay — 

 i.e., the one the tongue of which was in the main-line circuit. 

 This relay was then worked by the closing of a key, the line 

 current being broken at the tongue of the relay in the same way 

 as when the clock was operating the relay. This break was 

 recorded at Doubtless Bay and also on the front style at WelUng- 

 ton by the movement of the tongue of the Siemens rela\, at the 

 same time the clock was recording on the back style. It is 

 desired to indicate that for received signals the tongue of the 

 Siemens relay had to move to close the circuit, and the front 

 style then to move to mark the tape. The signals of the obser- 

 vatory clock had to cause the Post Office relay tongue to move 

 to close the circuit, and the back style then to move to mark 

 the tape. The record of the outgoing signals either from the 

 clock or by arbitraries was got after the clock or the key had 

 caused the Post Office polar relay tongue to break the circuit, 

 which in turn caused the Siemens relay tongue to move to close 

 the circuit of the front style, and which style had then to move 

 to impress the tape. The line was 704 miles long, Wellington to 

 Doubtless Bay, and was of IH copper throughout, 2001b. to 

 the mile." 



No repeaters were used. 



As it was impracticable for the observers to exchange stations 

 it was decided to observe for personal equation at Wellington, 

 and this was done. 



I took train to New Plymouth, thence by steamer to One- 

 hunga, and Auckland, and thence by the " Clansman " — the 

 connecting-link between the world and Ultima Thule — to Doubt- 

 less Bay. Here, close to the cable-station, the pier and observa- 

 tory were built. The foundation — a cubic yard — of the brick 

 pier (22 in. by 27 in.) was in compact sand, and hence very satis- 

 factory. The telegraph-line was led directly into the observa- 

 tory and there comiected with the switchboard. It may be 

 remarked that another pier was built in another building where 

 gravity observations were made Avith the Mendenhall half- 

 seconds pendulum ; magnetic observations were also taken. 



A triangulation has been carried over the North Island by 

 the Survey Department of New Zealand, and by instructions 



3— Trans. 



