104 



APPENDIX. 

 eye; Co Is tlie fine of B A E, to another fine, which is that 

 of the angle B ; the difference between 1 80 °, and the 

 fum of the two angles B A E andB, is the value, in de- 

 grees and minutes, of the arc G C of the earth's furface 

 intercepted between the eye and objedt. Multiply the 

 number of minutes and decimal parts of a minute in this 

 arc by the value of one minute in miles, fathoms, or fuch 

 meafure as may be moft convenient, and you will have the 

 diftance in the like meafure. 



EXAMPLE. 



The height of Snow Peak being 1503 yards, Its appa- 

 rent altitude above the horizon of the fea was obferved 

 to be — >— _ 1° 47' 6" 



The height of the eye being 16 feet, 



the complement of the di^ is - - - 82° 56' 11" 



The fum is EAB 91° 43' 17" 



To the femidiameter of the 



earth in yards 6966382 . - > - - 6966382 

 Add the height Add the height 



oftheobjedl 1503 of the eye ^} 



Semidiam.+height Semidiam.+height 



oftheobjea 6667885 oftheeye 6966387? 



As 



