VOI,. XLV.] PHILOSOPHICAL TRANSACTIONS. ^Qy 



-J. 



The Suns Eclipse of July 14, 1748. Observed at Marlborough House, with, 

 the Twelve- Foot Refracting Telescope, ^xed as a Finder to the Tube of the 

 Great Twelve- Foot Rejector. By John Bevis, M.D. N" 489, P- 321. 

 Apparent Time. 



July 14'' 9^ 3'" 50' The beginning, which perhaps might be 2' or 3' sooner. ,, 

 The end could not be precisely observed for flying clouds, at 12'^ g™ 15* it 



was not quite over; but at 12*' 9™ 35' the sun was clear, and nothing of the 



eclipse left. 



The Moon's Eclipse of July 28, 1748, observed at the same Place. By the 



same. N° 489, P- 522. 



July 28'' lO** 13"* 28' The penumbra discernible. 



16 30 The beginning, as most of the company judged. 

 12 24 30 The end. 



27 40 The penumbra quite gone. 

 About the middle of the eclipse, the moon's diameter, perpendicular to the 

 equator, measured in a 5-foot telescope, was 33' 50"; perhaps 1 5 ' or 20" greater 

 than it would have been found to be with a 12-foot tube. 



jIn Obsenatinn of an Extraordinary Lunar Circle, and of two Paraselenes^ 

 made at Paris, Oct. 20, 1747, N. s. and of the Eclipse of the Sun, July 14, 

 1748, o.s. By Augustine Nathaniel Grischow, Memb. of the Royal Acad, 

 of Sciences at Berlin, &c. N" 489, P- 524. 



October 20, at night, the sky was darkened by a slight fog, through which 

 the moon appeared of a fiery red colour, till S'' 40™, when the fog was quite dis- 

 persed, and the heavens were overcast with a whitish streaky cloud. At the 

 same time there appeared round the moon a halo, abcd, fig. 6, pi. 9, accom- 

 panied with 4 other segments of circles, 2 of which eap and gh of 10°, were 

 concentric, so as to have their common centre at the zenith. The segment or 

 arch iPL, on the north side, of 7°5 was concentric with the great lunar circle, 

 and consequently had the moon for its centre ; and lastly the arch mcn, which 

 faced the horizon, was of 12°. Besides these 4 segments, what was most re- 

 markable, was a mock -moon or paraselene b, shaped like a mock-sun or parhe- 

 lius. The diameter of this mock-moon, though ill determined, was of 35 

 minutes at least, with a tail bp opposite to the moon, as the tail of a comet is 

 opposite to the sun. This tail varied in its degree of light fi-ora time to time, ex- 

 tending as far as the arch ipl, which, as well as the arch gh, was 4° distant 

 from the lunar circle abcd. The paraselene b had the same colours with a 

 common parhelius, excepting that they were not so lively, but they were mucK 



