SOLAK ECLIPSE, MAY 6, 1883. 

 Table I. — Chronometer corrections in Greenwich mean or sidereal time. 



27 



Date. 



{If'ashiiiglon time.) 



Feb. -JS-OOO ■ - - - . 



2.U54 - - - - 



3.170 . - - - 



11.000 .... 



'J'2.140 - - - - 



Place. 



Mar. 

 Mar. 

 Mar. 

 Mar. 

 Mar. 

 June 



Washiugtoii 

 At sea - - 

 At sea - - 

 Aspiuwall - 

 Callao - - 



ii3.968 , At sea - 



1.07G Houolulu 



I 



Jmio 12.3S5 ----- Sail Francisco • 



1340. 



m. 8. 

 -6 .'■>;!. 78 



-7 3.8 

 -7 10.3 



203. 



/(. m. 8. 



1589. 



h. m. s. 



2786. 



A. m. 8. 



+ .■■> 7 29. 7 I + ,5 (i 35. -3 



j -flO 1 23.8 



+ 57 27.3 !+.'■, 7 10.3 ' +ld 57.3 



-f 5 7 30.9 + 5 7 49.7 i +10 21.5 



-8 3.5 

 -8 14.20 



+10 1 30. 7 +10 2 44. I 



+ 9 55 .51.0 

 + 9 55 3.73 



Date. 



( Washington time.) 



Feb. 28.000 - - - - 



Mar. 2.054 - - - - 



Mar. 3.170 - - - - 



Mar. 11.000 - - - - 



Mar. 2i.l40 - . - - 



Mar. 23.968 - - - - 



June 1.07() - - - - 



Place. 



1536. 



+10 



m. 8. 

 1 22.06 



233. 



Wasbington - 



At sea - - - 



At sea - - - 



Aspiuwall - - +10 1 39.3 



Callao - - - - : 1-10 1 .55. 1 ; - - - - 



At sea - - - - ( +17 24. 



Honolulu- - - +10 3 34.3 +20 0.9 



1988. 



June 12.385 i San Francisco - +10 3 47.78 



—5 34. 1 



—5 28. 5 



1065. 



425. 



-4 26.4 

 -4 41.9 



+1 57.3 

 +2 39. 1 



With regard to the corrections given in the preceding table some explanations are necessary. 



The corrections on February 28.000 were determined at the United States Naval Observatory, 

 those on March 2 and 3 by comparisons with 1340. The sextant ob.servations at Aspinwall consist 

 of three double altitudes of the sun, giving the correction to 1340 — 7'" 2^9. The comparison with 

 the chronometer of the Medtcay gave — 7'" 4:'.3. Giving the latter double weight, as it was said to 

 depend on equal altitude observations made the day previous, the correction — 7'" 3^8 results. Cor- 

 rections to the other chronometers were obtained by comparisons. They were used only in deter- 

 mining the chronometer rates from New York for obtaining the con-ections at Callao. 



The- corrections to be adopted at Callao received especial attention, as it was intended to make 

 this point one of the terminal points of the campaign. Unfortunately but two days were spent at 

 this port, and no observations were made. The corrections therefore depend upon comparisons 

 with the Hartford chronometers, and ujwu corrections deduced by using the rates from New Y'ork. 



Comparisons with the chronometer 1288 of the Hartford were made on March 21, using 202 as 

 a hack and 1340 as the standard for the expedition chronometers. These gave: 1340 — 1288 

 = 1"' 34^55; 1288 corr. —5"' 34».26 (given by the navigator of the Hartford) ; 1340 corr. —7'" 8'.8. 



The correction to 1288 depends upon sextant observations made March 4, on shore, by the 

 method of single altitudes brought forward by a rate determined for an interval of ninety-six 

 days, and checked by a deck observation March 18. The correction was furnished through the 

 kindness of the navigator of the Hartford. The computation of the chronometer corrections, by 

 using the rates from New York, was thus made : 



From the preceding table of corrections the mean rates were obtained New York to Aspinwall, 

 and from the chronometer comparisons March 10, 11, 14, 15, the mean values of the relative rates 

 between 1340 and each of the other chronometers. The temperatures changed greatl.y between 

 New York and Aspinwall, but were more constant between Aspinwall and Callao. A rate deter- 

 mined at Aspinwall is therefore better for carrying forward the corrections from Aspinwall to Cal- 

 lao. The comparisons March 10, 11, were the last made on the Acapxdco, and those March 14, 15, 

 the first on the Bolivia ; their mean was adopted for the relative rates at Aspinwall. The follow- 



