GREAT REFRACTING TELESCOPE AT ELCHIES, IN MORAYSHIRE. 



389 



Com- 

 ponents. 



A 

 B 



C 



A 

 B 

 C 

 D 



A 

 B 

 C 

 D 



A 

 B 



C 

 D 



A 

 B 

 C 

 D 



A 

 B 

 C 

 D 



(7.) 222 ARIETIS, R.A. l^^ SI'" 56% and D. + 20° 23' 14", January 1, 1862. 



Magni- 

 tude. 



85 



110 



9-2 



6 

 15 

 10 



9 



9 

 15 

 10 



6 



Colour. 



Yellow 



Position. 



AB 5°5 32 

 AC 167 22 



Distance. 



2-37 

 39-46 



Date. 



1832-42 



Topaz yellow 



Deep blue AB 53 



Lilac AC 165 



{w 1) 

 \w 2) 

 Pale blue AD 359 12 (ic; 2) 



2-5 



40-0 



165-0 



0«1) 

 (iy2) 



J 



Grey , . . 

 Blue . . . 

 Lilac... 

 Yellow 



(2) 



12 (2) Bluish (1) 



12 (2) Bluish (1) BC 169 15(w0'5) 37-26(io0-3) V 1862-74 



7-5 (2) Pale yellowish (1) BD 3.5 (ly OS) 182-01(w^0-3) J 



1 



9 

 10-5 

 9-25 

 6-25 



AB 53 42 



2-25 



AC 165 36 



36-2 



AD 1 36 



182-5 



(2) 



11-5(2) Bluish (2) 



13-5 (2) Blue (2) . BC 167 32 (w 0-5) 36-24(m/0-5) 



7 (2)Yellow(2) BD 1 23 (w 0'4) 181-12(w0-3) 



-1862-96 



Authority 



1834-99 Cycle. 



1856-68 AltaVista. 



Elchies. 



1862-9? Dawes. 



Lilburn 

 Tower. 



Some remarkable changes in magnitude, colour^ 'position, and distance, have 

 occmTed in this group, according to the authorities. A great writer has indeed 

 asserted, since the Elchies observation was published in the Notices of the Royal 

 Astronomical Society, that the magnitudes and colours assigned to A and D in 

 the Cycle, should be read mce versa for what they are put down. (See Monthly 

 Notices R. A. S. for December 1862.) If this point can be proved, it will greatly 

 alter some of the changes believed to have been experienced ; and instead of the 

 Elchies observation, as well as that at Lilburn Tower being interpreted to show 

 that " A" was missing, and " B " only left outstanding, we may then consider 

 that both A and B were seen on each occasion, but indistinguishable the one from 

 the other, by reason of disturbed aerial vision ; in which case too, in place of the 

 other positions and distances being entered under the letters BC and BD, they 



D. But granting that 



A , "p A -I- "R 



should rather be registered under — o— C, and 



2 ^' 2 



alteration, and also the demanded inversion of the Cycle magnitudes and colours 

 for A and D, there still remain as notanda in the group, — 



J St, The decrease of distance in the last thirty years of A and C ; 



