38 



MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



CHRONOMETER COMPARISONS. 



1340. 

 h. m. 8. h. 111. 8. 



1 20 56 = 10 4 30 chron. 202. 



23 22. 5 = 10 5 15 chron. 1589. 



24 36 =5 13 30 chrou. 1536. 



CHRONOMETERS REMOVED FROM SHIP TO THE SHORE. 



h, m. a. h. m. s. 



2 9 53 = 10 53 35 chron. 202. 

 10 5 = 52 5 chron. 1589. 

 10 38.5 = 5 59 40 chron. 1536. 



Reduction by method of equal altitudes, combiuiDg with observations April 21, a. m., and April 22, a. m. W. 

 Upton, computer. 



[Caroline Island, April 22, a. m. Double altitudes of sun. Chronometer, Negu.s, 1589. W. Upton, observer and 



recorder. ] 

 I. INDEX CORRECTION. 



II. 



CHRONOMETER COMPARISONS. 



1340. 1589. 



h. m. «. h. m. s. 



5 31 41.5 = 2 16 10 



6 40 0. 5 = 3 24 40 



Reduction by method of equal altitudes, combining with observations April 21, p. m., and April 22, p. m. W. 

 Upton, computer. 



[Caroline Island, April 22, p. m. Double altitudes of the sun. Chronometer, Negus, 1589. W. Upton, observer 



and recorder.] 

 I. INDEX CORRECTION. 



II. 



CHRONOMETER COMPARISONS. 



1340. 1589. 



h. m. 8. h. m. ». 



1 29 49. 5 = 10 15 35 



2 28 40 = 11 14 35 



Reduction by method of equal altitudes, combiniug with obsorvatious April 22, a. ra. W. Upton, computer. 

 (Observations were also made April 23, a.m., but were not used in the reductions.) 



