56 



Richard Jaegekmann. 



while in others the markings could best be seen with the naked eye. The negatives were 

 placed upon a retouching frame and measured with a steel scale. To obtain as unbiased a 

 result as possible, three observers each made upon two days two independent measures, 

 separated by a short interval. The other observers besides myself were Messrs. 0. C. Wen- 

 dell and E. S. King. In table LXX the first and second columns give the time of the 

 middle of the exposure expressed in days, hours and minutes, and also in fractions of a day, 

 the third column gives the mean of the twelve measures of the distance expressed in milli- 

 meters, and the fourth the same reduced to arc. The negatives were taken upon a scale 

 179''l to the millimeter, but a slight correction was necessary for the position of the comet 

 upon the plate. The maximum value of this correction never exceeded 20". 



Table LXX. 

 Distance of the bright region from the nucleus. 



Greenwich Mean Time. 



Millimeters. 



Arc. 



April 5 : 



21 A 56 m 



5f914 



5.50 ± 0.07 



0°16' 20" ± 13" 



» 6 



21 48 



6.908 



15.00 ±: 0.20 



44 46 ± 36 



» 7 



22 30 



7.937 



34.47 ±0.20 



1 42 32 ± 36 



» 8 



21 21 



8.889 



59.53 ± 0.24 



2 57 29 ± 43 



» 10 



; 22* 50 m 



10.951 



138.43 ±0.30 



6° 52' 39" ± 54" 



Auf Grund einer mir von Herrn W.H. Pickering in einem Briefe vom 23.Dez. 1904 

 freundlichst gemachten Mitteilung unter genauer Angabe der bei den obigen Messungen 

 benutzten Plattennummern x ) sind diese Beobachtungsmomente in der folgenden Weise etwas 

 abgeaudert : 



Platte 



Expositions- 



Mittlere Zeit 



Mittlere Zeit 



J\£ 



dauer. 



Greenwich 





Berlin: 



7364 



133 m ; 



1892 April 5; 



20 A 52 m 



1892 April 5-906 654 



7365 



55 ; 



» 6; 



21 48 



» 6-945 543 



7367 



61 ; 



» 7; 



21 22 



» 7-927 488 



7387 



55 ; 



» 8; 



20 10 



» 8-877 488 



7397 



65 m ; 



» 10; 



21 A 3T 



» 10-933 738 



1) Loc. 



cit. pg. 268. 





