//. A. Newton— Fireball of January J 3th, 1893. 167 



Mr. Henry Hartman saw it from Washington Heights " at 

 an angle of about 45°," and its diameter before bursting 

 seemed about 16 inches. It burst into fragments before dis- 

 appearance. 



26. The Lewis Photograph. — The track which appears on 

 Mr. Lewis's photograph has very clearly marked margins, and 

 part of the way has also a clearly denned central track. The 

 stars near the center of the plate have well rounded figures, 

 and even near the margins of the plate the star figures can be 

 bisected with a fair degree of accuracy. The probable error 

 of position is less evidently than that of the Bonn Durchmiis- 

 terung places. I therefore selected from the stars near the 

 track six couples of stars, and one isolated star each of which 

 had been observed at Leyden. The couplets were of stars 

 near the track, one on each side of it. No second suitable star 

 was available on the plate for use with the odd star. With a 

 filar micrometer the distances of these stars from the track 

 were measured and the position of the point where the line 

 joining two stars of a set cut the center of the meteor track 

 was computed. This process avoided the necessity of consider- 

 ing the scale value of the micrometer screw, except for the 

 distance of the odd star from the track. 



Table I, showing the measured positions of seven points on the photographed 

 meteor path, and their distances from a great circle through the extreme 

 points. 



Xo. ot 



Name of 



point. 



star,B. D. 



1 



33°. 273 





33 . 23+ 





33 . 233 



3 



33. 190 



33. 189 



4 



33 . 138 



33 . 133 



5 



32 . 101 



32 . 99 



6 



32 . 85 



32 . 8u 



7 



32 . 48 



32 42 



E. A. of star !N\ Decl. of star. 

 Leyden, 1875-0. Leyden, 18750. 



] h 3 3m 



1 20 

 1 20 

 1 7 

 1 7 

 (t 50 

 49 

 30 

 29 

 25 

 24 

 14 

 13 



15^-12 

 0-26 

 0-05 



20-97 



9-82 

 4479 

 14-70 

 12-45 

 44-39 

 44-39 

 47-58 

 21-67 

 10-82 



42' 24"-4 



39-5 

 14-6 

 409 



20 3 

 38-7 

 18 8 

 51-2 

 10 

 42-7 

 30 4 

 10-7 

 375 



R. A., 



18750. 



H".] 



Decl. 



1875-0. 



G.Circle 



l h 33 ra 



15 s 12 



33 c 



48' 



20"-0 



o"-o 



1 20 



0-15 



33 



47 



57-0 



-10-2 



1 7 



15-40 



33 



42 



30-6 



-23-3 



49 



58-38 



33 



27 



24 7 



-31-0 



30 



6-62 



32 



59 



11-0 



— 15-0 



25 



12-20 



32 



50 



7 7 



-25-3 



13 



51-91 



32 



27 



17 



o-o 



In this way were obtained the right ascensions and declina- 

 tions of seven points on the track. In Table I are given the 

 comparison stars with their places as determined at Leyden. 

 In the fifth and sixth columns are the seven places centrally 

 on the track. Drawing a great circle through the two ex- 

 treme places and computing the declinations on that circle for 

 the right ascensions of the fifth column, and subtracting these 



