Invariable Pendulums at the Cape and on the Euphrates. 603 



the following number of Aibrations at the two stations above-men- 

 tioned, viz. 



The Elements of the Annular Eclipse of the Sun that will happen 

 on October 8, 1847. By Mr. George Innes. 



These elements have been deduced from Carlini's " Solar Tables" 

 (1832), and Burckhardt's " Lunar Tables" (1812). The time of 

 apparent conjunction in right ascension at Greenwich will be Oct. 

 8^* 19** 28" 36^-593; at which time the sun's apparent semidia- 

 meter will be 16' 2"-529, and the moon's augmented semidiameter. 

 14'43"-968; 



Greenwich 

 mean time. 



18 hours 



19 do 



20 do 



21 do 



21" e" 37'-755 



22 hours 



Sun's right 

 ascension. 



195 19 31-390 

 195 21 59-783 

 195 24 28183 

 195 26 56-616 

 195 27 13-036 

 195 29 25-054 



True right 

 ascension. 



194 6 41-844 

 194 8 59-511 

 194 11 17-180 

 194 13 34914 

 194 13 40125 

 194 15 52-614 



Declination 

 south. 



62 20-693 



63 17-975 



64 15-247 



65 12-525 



65 18-861 



66 9-797 



Equation 

 of time. 



12 29-507 



12 30-245 

 12 30-930 



1231-597 

 1231-670 



12 32-271 



Serai, 

 diameter. 



16 2-512 

 16 2-524 

 16 2-536 

 16 2-546 

 16 2-549 

 16 2-566 



Greenwich 

 mean time. 



Moon's true 

 longitude. 



Longitude 

 north. 



Equatorial 

 horizontal 

 parallax. 



18 hours 193 54 30-843 22 49-641 53 54-130 



19 do 1942459-7682532-8335354-197 



20 do 194 54 28-77128 16-44653 54-214 



21 do 195 23 57-79030 59-751 '53 54-325 



2ih6'"37'-755:i95 27 13-036i31 17-61053 54-326 



22 hours .... 195 54 26-993 33 42-861 53 54^409 



Horizontal 

 semidia- 

 meter. 



True right 

 ascension in arc. 



1441-30011925744-323 

 1441-3161932645-329 

 1441-3201936427-307 

 1441-351 19422 50127 



1441-351 19425 55-127 

 1441-428 19451 13-894 



Declination 

 south. 



8 47-322 

 17 42-208 

 26 35-565 

 35 27-710 

 40 34-132 



5 44 18-646 



Obliquity of the Ecliptic 23 27 2514 



Sun's semi-diameter 16 2-529 



horizontal parallax ... 8 "5925 



latitude -|- 0-179 



On the Comparison of the Neapolitan Standard Yard with the 

 Standard Yard of this Society. By Mr. Simms. 



The Neapolitan Government having directed Mr. Siraras to con- 

 struct a new standard scale, on a principle similar to that which 

 was made for this Society, the object of the present communication 

 waa to place on record the results of the comparisons that were 



