.002 FURTHER OBSERVATIONS ON THE ECLIPSE &CC. 



ed with a small telescope. Four of these observations were 

 made on the 14th, one on the 16th, and three on the 17th. 

 In observing the eclipse, I used the achromatic telescope of 

 my sector already mentioned, its magnifying power is about 

 30. The commencement of total obscuration is mostly to be 

 depended on. Before the re-appearance of the sun, I lost it 

 out of the field of the telescope, and I unfortunately omitted 

 to remove the dark glass ; I therefore noted the end of total ob- 

 scuration, only by the naked eye, and of course cannot so 

 much depend on it. It is probably taken some seconds too late. 

 The arrival and departure of the penumbra, were taken tolera- 

 bly accurate. The air was uncommonly serene, and afforded 

 the finest opportunity for observations. 



k / * 



Commencement of the eclipse, A. M. Apparent time. . . , . 9 50 12 



Commencement of total obscuration. . . . . . . 11 8 06 



End of ditto. . . . ' 11 12 57 



End of the eclipse 12 33 08 



Duration of total obscuration 451 



Duration of the eclipse 2 42 56 



I intended to have forwarded this last fall, as soon as I could 

 get the painting done, but the navigation of our river being 

 obstructed earlier than usual, my intentions were defeated. 



I am, with great regard 



Your obedient humble Servant, 



S. DE WITT. 

 Doctor Benjamin Rush. 



The following errata have been found in the communications of J. J. De Ferrer in this 



Volume. 



Page 163, line 31. Cayo Sta. Maria. Lat. for 23° 12' 00" read 22° 39' 24" 

 164, last line, for Tenerifi'e, read In the Azores. 

 224, line 4. for Idem of the secular equation = 54" 96 read 



Idem of the secular motion = — 54 96 

 226, line 11. for 5^ 35' 48" read 5>' 35' 38" 

 11. for 6 09 56 read 6 09 46 

 11. for 6 36 read 6 00 26 V 



228, line 48. for it= — - X a=15,8072 read 



E+l. tang. Q 



w= x a=15,80r2 



E-l. tang. X 



228, line 51. for n' = ? va'="8,3865 read 



E'-l' tang. B' * 



n' = i v a' =8,3865 



E'+l' tang. 0' * 



232, line 32. for apparent elongation at the ingress 934" 416 read 934" 437 



