( 104 ) 



3 secs. It was probable that this must be attributed to the chrono- 

 meter Hohwü, which supposition seems confirmed by the time deter- 

 mination at N'Kutu of June 5 if we reduce it to Chiloango with the 

 difference of longitude determined in Dec. 1903, but it is undoubtable 

 that we have here a source of uncertainty for the following deter- 

 minations of longitude. I already remark here that I have finally accepted 

 no jump in Hewitt and one of 2 seconds in Hohwü. For the daily 

 rate of the latter we then must accept -j- s . 91 instead of -\- s . 83. 

 In addition I remark that also for the determinations in 1904 I have 

 assigned equal weights to the two chronometers. 



3. Determinations of longitude in 1904. 



Mayili. On June 2 I here secured a time determination by means 

 of Sirius west, and of « Bootis east of the meridian. The results 

 obtained from the two, corrected for division errors and flexure, 

 differ inter se by 9 .37. 



Here follow the mean results, to which I have added the correc- 

 tions to the mean time of* Chiloango derived by means of the adopted 

 ra t es (_|_ s . 91 for Hohwü and a variable rate for Hewitt) and the 

 difference of longitude derived thence. 



June 2 6^5 M.T. Chiloango 



Hohwü Hewitt 



Correction to M.T. Mayili + 49™50 s .89 + 50 m 36 s .39 

 „ „ Chiloango + 48 29 .33 + 49 17 .08 

 Difference of longitude — 1 21 .56 — 1 19 .31 



Mean — l m 20 s .44 

 In 1902 I had found — l m 2K3. 



If we had derived the correction of Hohwü with a rate of -f-0 s .83, 

 the difference of longitude according to this chronometer would have 

 been — l m 21 s .80, while Hewitt with an assumed constant rate 

 would have yielded — l m 19 s ,89. 



N'Kutu. Here I was obliged to have recourse to the sun for 

 determination of time and on June 5 I obtained the following results 

 from 4 observations of the two limbs in the two positions of the 

 instrument. I now begin by deriving the correction of Hohwü to 

 the M. T. of Chiloango, without accepting a jump, and therefore 

 with the rate -f s . 83. 



