the Tiigonomrirical Station on Bumbles Moor, Yorkshire. 2.59 



The level of the right index being found broken, the error 

 of coUimation was in this instance determined at every obser- 

 vation by noting the angle (in the first place) with the left 

 one; then turning the telescope half round {the pointure beino- 

 made good), the instrument was again inverted and the lett 

 uidex re-levelled. The angle noted differed from the pre- 

 ceding one by double the error of coUimation. 



-f-I. H. 5' 15" 1 obs. W. 91-1 93-2 



-fR. L. 5 36 1 yV"eg. S.S.E. 487-0 485-4 



+ G.W. Rock. 8 48 1 ^>^ E. 26-1 28-6 



F. F. 11 44 1 tV S.E. 1107-5 1110-6 



P-H. 17 20 1 ^\j S. by W. 454-7 452-3 



(R. H.) Raisegill Hag. Wall 1981 h feet. 



1822. April 30, 11" to \^\ Th. 58 to 62. Bar. 28-558. 15 obs. 



P. G. 3' 36" 1 obs. S.W. 294-8 294-1 



W. S. Wall. 4 1 ^'^ E. byN. 319-4 319-2 



E. S. Wall. 4 2 1 ^V E. 305-2 306-3 



G. W. Rock. 6 34 2 y^ E.S.E. 325-1 322-7 



(L. B.) Laiv Birks. Stone \Q^9{feet. 

 1822. April 20, 12" to 14^. Therm. 39 to 43. 16 obs. 

 Raisegill Hag and Low'Birks are part of the ridge of lime- 

 stone and grit separating Wharfdale from Littondale. Its 

 direction from Skirfare Bridge is N.W. 



E. S. Wall. 

 W\S. Wall. 



fG. W. Rock. 

 P.G. Wall. 



F. F. 



_P. II. 



(P.M.) Pcndle Hill. The ground contiguous to the north 

 side of the Beacon hillock 1829 Jeet. 



1821. September 24, see vol. lix. page 133. 

 The base to the north is limestone ; to the east grit. Halt- 

 way up the mountain on the north the excavated /z^;y roads 

 are upon a dark-coloured iron-itained schist, nearly vertical. 

 Two-thirds of the height from the summit are of grit, with 

 precipitous declivities to the east and north. It is so finely 

 nisulated, that were tlie station removed a little more to the 

 westward, the plumb-line would in all probability be whoUy 

 unaffected. 



K k '2 R. M- 



