Fig. 17. Fig. 18. 



ECLIPSES. 



CHAPTER II. 



35. Observations of Mr. Dawes near Engelholm. 36. Effects of total obscura- 

 tion on surrounding objects and scenery. 37. Evidence of a solar 

 atmosphere. 38. Probable causes of the red emanations in solar 

 eclipses. LUNAR ECLIPSES : 39. The earth's conical shadow. 40. Its 

 section may be regarded as a dark disc moving on the firmament. 

 41. Conditions which determine lunar eclipses. 42. Lunar ecliptic 

 limits. 43. Greatest duration of total lunar eclipses. 44. Effects 

 of the earth's penumbra. 45. Effects of refraction of the earth's 

 atmosphere in total lunar eclipse. 46. Lunar disc visible during 

 total obscuration. 



35. MR. DAWES near Engelholm observed the beads, and found 

 all the circumstances attending their appearance, such as to leave 

 no doubt as to the truth of the cause generally assigned to them. 

 He observed the corona, a few seconds after the commencement of 

 the totality, and estimated its extreme breadth at half the moon's 

 diameter, the brightness being greatest near the moon's limb, and 

 gradually decreasing outwards. The phenomena of the red pro- 

 tuberances, witnessed by Mr. Dawes, are so clearly and satisfac- 

 torily described by him, that we think it best here to give the 

 account of them in his own words : 



" Throughout the whole of the quadrant, from north to east, 

 there was no visible protuberance, the corona being uniform and 

 uninterrupted. Between the east and south points, and at an 

 angle of about 170 from the north point, appeared a large red 

 prominence of a very regular conical form, fig. 18. When first 

 seen, it might be about \\' in altitude from the edge of the moon, 

 but its length diminished as the moon advanced. 



LARDNER'S MUSEUM OF SCIENCE. N 177 



No. 155. 



