'^z InUrumental InftruBions 



From tvhence plot your Field, in this Man- 

 ner. In any Part of your Paper draw a Line 

 N S, for your North and South Line, or Me- 

 ridian Line ^ crofs it, at right Angles, in any 

 Point, let it be at Point E, and draw the 

 Line W E for your Eaft and Weft Line ^ fo 

 Ihall thofe two Lines reprefent the two fix'd 

 Diameters of the Inftrument. On W E lay 

 the Diameter of the Protrador, with its Cen- 

 ter on E, (the Point of meeting of the two 

 Lines N S and WE) Angle A being 6 De- 

 grees. 30 Minutes , make a Dot in the Pa- 

 per, againft that Qiaantity, and from Point 

 E, thro' that Dot, draw an occult Line 

 E A at Pleafure, diftance E A, being 3 Ch. fet 

 5 Ch from E A^ Angle B is 6^ Deg. which 

 prick off your Protrador, and draw the occult 

 Line E B, which being 2 Ch 14 Li. fet that 

 Quantity from E to B, and draw A B5 Angle 

 C being 151 Deg. go Min. prick it off, and 

 draw E C, which being 2 Ch. 51 Li. fet that 

 Quant.from E to C.and draw B C^ Ang.D is95 

 Deg. which being in another Semicircle, place 

 your Protraftor on W. E. with the Semicircle 

 downwards, and pricking off 95 Deg. draw 

 ♦he occult Line E D, which being i Ch. 90 

 Li, fet it off from E to D, and draw A D. 



This Snrvey imagines the Field to be a Le- 

 vel, but in Regard the Surveyor may be to 

 feek when he meets with an hilly one, let A 

 B C D be; fuch a Feild, and therein the Hill 

 O, FiGi VI. \^^ 



Place 



