34 TRANSIT OP VENUS, 1874. HONOLULU. 



h 



1874, December 22.23. Arrived at Wai mea. 



23. 6. Left Waimea. 



24. o. Arrived at Honolulu. 



1875, January 2. 3. Left Honolulu. 



22. Arrived at Kailua. 



4. 8. Left Kailua. 



5. 12. Arrived at Honolulu. 

 9. 6. Left Honolulu. 



22. Arrived at Waimea. 



10. 8. Left Waimea. 



11. 22. Arrived at Honolulu. 



76. From December 14 to December 21, I went in charge of the 

 chronometers ; from December 22 to January 12, Mr. Nichol was in 

 charge of them. They were wound every day at noon. 



Immediately on arrival at a station, and immediately before departing, the 

 chronometers were compared with the Transit Clock, three chronometers 

 being used for this purpose, as before described, the comparisons being made 

 by the responsible observers with as little delay as possible. 



At Kailua the portable chronometers had to be carried about a quarter 

 of a mile from the landing place to the Transit Observatory ; at Waimea 

 about half a mile. 



77. In reducing the comparisons, the error of each portable watch on local 

 mean solar time at the instant of its comparison with the Transit Clock was 

 first found, assuming for this purpose the following longitudes of the 

 observatories : 



h m s 



Honolulu 10. 3i. 25 W. 



Kailua 10. 24. o W. 



Waimea 10. 38. 40 W. 



As each ship chronometer was compared with each portable chronometer 

 before and after the latter was compared with the Transit Clock, the error of 

 each traveller on local mean time was directly obtained corresponding to the 

 instant of the latter comparisons. The separate errors derived from each of 

 the three portable watches never differ many hundredths of a second. 



78. The whole of the comparisons of the portable chronometers with the 

 standard timekeepers at the three stations are exhibited in Table XII. Of 

 the determination of the errors of the ship chronometers, it is thought 

 sufficient to give the specimens in Table XIII., while their errors on each 

 day are given in Table XIV. The stationary and travelling rates are shown 



