PHILOSOPHICAI, TRANSACTIONS. [aNNO ] 686. 



Lunar Eclipse observed at Liibon, Nov. 30, 1686. By Mr. Henry Jacobs. 



■i ariJ sit ^^(so^y^ h. m. 



The beginning 8 2 



^ii! Immersion g 6 



In ■ Emersion JO 50 



The end 11 57 



^lit,e ,,0(ifepfation of Jupiter's Occultation by the Moon, March 31, 1 686; made 



.'jlqmnxo ir/ : by Mr. Flamsteed. 



-03,1 At ^[U'd'h i3Q. . the first contact of the limbs, 



ieiri liiuotk I ,{\\ 9 / 33 42 . . the complete immersion, 



■' ^ •■ ' ' 10 30 30 .. beginning of the emersion, 



10 31 36 . . end, or complete emersion. 



Account of the Nntural History of Staffordshire. By Robert Plot, LL. D. 

 , Keeper of the Ashmolean Museum, and Professor of Chemistry in the Univer- 

 \ sity of Oxford. N° 184, p. 207. 



- There is very little or no need to take notice of the method of this work, 

 since it is drawn up and conducted after the same manner as the Natural His- 

 tory of Oxfordshire, written some year's before by the author, of which an ac- 

 count has been given in these Abridgments, vol. ii. p. 394. 



.Qi' 



Account of Sciotericum Telescopicum, or a new Contrivance of adapting a Teles- 

 cope to a Horizontal Dial, for observing the Moment of Time by Day or Night. 

 By Will. Molyneux, Esq. R.S.S. Dublin, 1686, in 4to. N° 184, p. 213. 

 The author first declares the use and advantage of this new contrivance, 

 which he conceives to be very great, especially when the observation of the 

 exact moment of time is so necessary, that neither geography, navigation, or 

 astronomy, can be brought to perfection, nor the longitude or the truth of 

 astronomical tables fully discovered. The methods which commonly are used 

 for observing the moment of time, are either by dials, or by taking the sun's 

 altitude by day, or that of stars by night ; or by observing the altitude and azi- 

 muth of the sun or stars, or by the transits of the sun or stars over the meri- 

 dian, or the coming of some circumpolar stars to the same vertical with the 

 pole star ; all which methods are attended with many difficulties, which the 

 author thinks his way will avoid ; at least the most material ones, which com- 

 monly arise in the practice. Here is no need of any calculation of oblique 

 spherical triangles, all being done by a plain and simple observation, and by the 

 addition and subtraction of two or three small numbers, and that to such exact- 



