for Gardenbrs, &:c. 71 



are fixd perpendicular Sights for cutting Ob- 

 Objeds. The whole InlTruraent is fult.iin'd, 

 as a plain Table is", and its Ufe follows in the 

 Survey of Field A B CD, preceding. 



Place the Inftrument at Point t, the Index 

 lying on the Diameter, "cutting 180 atid 360 

 Decrees, and turn it about horizontally, 'til 

 the Needle hang due North and South, and 

 the two fix'd Diameters diall then anfwer the 

 Lines K, 'S. and W. E. . >/ 



Meafure from Station E, to the four 'Angles, 

 as has been , taught, then^'dired: the Sights of 

 the Index to Point A, Which will cut 6 Deg. 

 30 Min. (reckon'd from the Weft Point of the 

 central Line of the Diameter, reprefehting, £• 

 and W.). Point B will cut 6<^ Deg, reckon d 

 from the aforefaid Pointy Point C will cut 

 151 Deg. 30 Min. reckon'd from^ the fame 

 Pointy but Point D will cut95 Deg; which,be- 

 ing in another Semicircle, you are therefore to 

 reckon from the Point of Eaft in the Inftru- 

 ment. 



Thefe Sides and Angles being thus found, 

 your Field-Book will ftand as follows. 



\ 



Fxoni 



