672 The Account of a 



Scilly Islands. 



To determine the distances of the objects in these islands, 

 from the stations near the Land's End, with sufficient accuracy, 

 proper corrections were made for reducing the horizontal angles 

 to those formed by the chords. On the present occasion, it will 

 be right to use the horizontal, and not the chord angles; the 

 distances from the meridians, and from their perpendiculars, 

 being computed on the supposition of the earth's surface being a 

 plane, which, within the limits of our fixed meridians, may be 

 considered as true. 



The angles for finding the distances of these objects are given 

 in the Philosophical Transactions for 1797, p. 503; from whence, 

 and the data contained in this Work, we get the bearing of 



the Day-mark in the Island of / f' ^0™ 75° 41' 5*" S W 

 St. Martin's from - P ert »™y 71 14 ** SW 



LSennen - 75 30 9 SW 



which, combined with the distances of the stations from the 



meridian of St. Agnes, give 



o^fiR 01 V eet > f° r tne distance of the Day-mark from the 

 2 ^fi8°^ I me ridian of St. Agnes ; 



and 122409 "I 



122410 [feet, for the distance of it from the perpendicular. 

 122414J 



The mean of the first is 246809 feet, and the mean of the last 



122411 feet; but the latter becomes 122419, because a line 



drawn from the Day-mark, perpendicular to the meridian of 



St. Agnes, cuts that meridian eight feet below the parallel. 



Again, we get the bearing of 



the Windmill - - - Tin the Island of St. f Pertinney - 65°32'3o'SW 

 the Flagstaff of the Fort / Mary, from \ Pertinney - 66 53 5 S W 



