OP A METEORIC FIRE-BALL. 49 



Nos. 123 and 226. The azimuths of both these observations were measured from the course of 

 Fourth Street, which being assumed to be at right angles with Broadway, and the course of the 

 latter street being, according to the map of the Harbor Commissioners, from S. 32° 31' W. to N. 

 32° 31' E., that of the former varies 57° 29' from the meridian. Both these observations will be 

 much better satisfied, if the course of Fourth Street varies 58^° or 59° from the meridian. 



No. 125. Assumed azimuth N. 1° E. 



No. 133. This is the altitude and azimuth as observed at the time of the disruption of the meteor. 

 According to the calculated path, the disruption occurred three seconds earlier, when the azimuth 

 was about N. 74° E. It is not improbable that a few seconds may have elapsed after the disruption, 

 before the parts became separated far enough to attract notice. 



No. 144. Observed maximum altitude "considerably more than 45°;" "somewhere near 60°."' The 

 assumed azimuth is that of the greatest altitude very nearly. Time by observation 9'' 45". 



No. 148. Time by observation 9'' 43". 



No. 149. "Passed 3° or 4° south of the Eagle." At the point of nearest approach to Altair 

 (a Aquilas) the distance by calculation was about 8°. 



No. 162. Geocentric altitude of "the north star" (Polaris) 40° 14' 53". 



No. 165. Assumed azimuth when nearest the zenith N. 10° E. 



No. 175. Corresponding to the maximum altitude. 



No. 179. In order to satisfy this observation the azimuth must have been about S. 82° E. 



No. 180. Assumed azimuth N. 1° W. 



No. 185. The meteor was observed to pass within 2° of a Lyrse, whose altitude was 78° 3' 38", 

 and azimuth S. 79° 7' 23" E. The point of nearest approach, according to the calculated path, 

 was when the azimuth of the meteor was about N. 38° E., and its altitude about 73° 49'; the dis- 

 tance being then about 15°. 



No. 187. Time by observation 9'' 42™. 



No. 204. Approximate azimuth when the altitude was a maximum. 



No. 205. "Passed very near >. Cor. Borealis," whose altitude was 68° 9' 9", and azimuth N. 

 88° 8' 23" W. The point of nearest approach, according to the calculated path, w^as when the 

 azimuth of the meteor was about S. 69° W. and its altitude 67° 29'; the distance being then about 

 8° 33'. 



No. 206. Approximate azimuth when the altitude was a maximum. 



No. 207. Time by observation 9'' 50". 



No. 208. Approximate azimuth when the altitude was a maximum. 



No. 211. Approximate azimuth when the altitude was a maximum. 



No. 219. Time by observation 9'' 50". 



No. 222. Time by observation 9'' 55". 



No. 226. See No. 123. 



The following map (Plate 1st) shows the line over which the meteor is com- 

 puted to have passed vertically, A being the point over which it is assumed to have 

 first become visible, and B and C points over which disruptions occurred. It shows 

 also the places Avhere observations were made, indicated by dots, and where space 

 allows, the name is given, or a reference number. The rest may be identified by 

 their geographical positions. 



Plate 2d is a profile section, in which the vertical lines show the heights of the 

 meteor at difierent points along its path, as given in Table I. 



