SOLAE ECLIPSE, MAY 6, 1883. 



33 



Naval Observatory, the observation of moon culminations made at Wasbington have been reduced, 

 and their results communicated, as follows : 



The observation on April 27 can therefore be reduced by diiect comparison with the observa- 

 tion at Washington, and that of April 25 by applying to the ephemeris place the correction — OMl, 

 which increases the longitude by 3M. The following are the resulting longitudes : 



Mean - 



10 55. 3 



Resulting longititje. 

 From the preceding sections we have the following values' of the longitude : 



h. m. s. 



10 .59.0. Seven chronometers, Callao to Honolulu. 



10 57.1. Two chronometers, New York to San Francisco. 

 10 53.0. Four chronometers from Tahiti. 

 10 55.3. Two moon culminations. 

 On account of the uncertainty in the assumed position of Tahiti it was decided not to use the 

 third value given above, but to take the mean of the other three, giving the first double weight. 

 The resulting longitude is — 



150° 14' W"' 1 ^^^^ ^™™ Greenwich. 



ADDENDUM. 



TABLE OP CHRONOMETER RATES, AND OBSERVATIONS WITH THE SEXTANT FOR TIME AND 



LATITUDE. 



Relative Chronometer rates. 

 The following table contains the relative daily rate of each chronometer referred to 1340, 

 deduced from the chronometer comparisons, and designed to check the running of the chronometers. 

 The rates between New York and Callao were also used, as previously explained, in determining 

 the corrections at Callao. The discordancies in the first part of the voyage are doubtless due to 

 the rapid change of temperature after leaving New York. Between Callao and Honolulu a maxi- 

 mum and minimum thermometer, placed near the chronometers, was daily read. The tempera- 

 tures increased gradually from 12° to 86°, reaching the maximum ofi" Caroline I.sland, and decreas- 

 ing to 74° on the journey to Honolulu. The daily range was only 2° or 3°, and could not always be 

 determined, because the motion of the vessel disturbed the indices of the thermometers. The rates 

 in this part of the voyage were very constant, as will be seen from the table. Chronometer 202 was 

 used as a hack. Chronometer 2786 ran poorly, and also its second hand was a little out of posi- 

 tion, so that some confusion arose among the different obser\ers as to which half-second to adopt 

 in reading. The latter circumstance accounts for part of the discrepancies at Honolulu. The com- 

 S. Mis. 110 5 



