*32 Observations on the Anmdar Solar Eclipse. 



It must, however, be remarked, that the greatest temperature 

 in the shade as indicated at 1^^ 50"% is by no means the great- 

 est temperature for the day, as it generally attains that point 

 between the hours of two and three o'clock. With the object of 

 attaining the hour of maximum temperature, some observations 

 were instituted for the purpose. The sky and aspect of the day 

 being in close resemblance to that of the eclipse, it was found 

 that the same instrument in the shade indicated its maximum at 

 S^ SO™, and having become stationary at 69^. The tempera- 

 ture at 1^ S8'" of the same day being 66^, we may therefore at- 

 tain from these observations an appj'oaimate temperature for 

 the period of greatest obscuration, or of least temperature on the 

 15th. This we may assume at 64, whilst that actually observed 

 was 55^, there being a difference of 8 J. This difference, there- 

 fore, may be assumed as a close approximation to the loss of 

 heat ill the shade by the interception of the solar radiation. 



Observations on this beautiful phenomenon were directed not 

 only to the changes of temperature, but also to the progress of 

 the phases, and the following are the results expressed in mean 

 solar time, at the place of observation, which was at Inveresk, 

 near Musselburgh, in latitude 55° 56' W N. ; longitude 

 3° 2' 40'' W. 



h. m. s. 



First contact of the limb, 1 33 44 



First do. of the annulus, . . . . . . 2 57 56.5 



Last do. of th2 annulus, 3 2 34.5 



Last do. of the limbs, 4 19 52 



Occultation of the Spots on the Solar Disc, 



h. m. •. 



Spot on sun's western limb, . . . . (a) 1 40 3 



Large well-defined spot towards sun's centre, . {b) 1 52 47 . 



Small spot near lowest cluster, . . . . (c) 1 13 44.5 



Small spot under the large one, . . . . (rf) 1 14 45.6 



tTppermost of two single spots above the large one, {e) 1 33 9.5 



Large spot of the upper cluster, . . . . (/) 2 22 16.5 



Emmersion of large spot, 3 33 33 



Emmersion of spot (e), 3 34 41 



On surveying the solar disc before the commencement of the 

 eclipse, it presented a numerous collection of spots, chiefly con- 

 fined to the west of the sun's centre, and dispersed vertically in 

 an irregular form ; some of them were single, having the ap- 

 pearance of a dark nucleus, with a well-defined edge, and sur- 



