94 Injlrumental Inflru£lions ^ 



Remove any fmall Diftance as to Point * 

 F, where bringing the Needle to the Isorth 

 and South Points, as before, (crew the Inftru- 

 ment faft, and dired: the moveable Index to 

 cut the fara;: Wind mill in 75 Deg. reckonM • 

 from the Point of Eaft, Set i Ch. 16 Li. 

 from E to F, and then you may tind the oc- 

 cult Triangle E F G, and alfo either Diftance 

 F G, or E G, thus : 



Draw a Line at Pleafure F E, for an Eaji ' 

 and Weft Line, aiTume therein the Point B 

 for your hrft Place of Obfervation ^ and fet- 

 ting I Che 16 Li. from E to F Points, F is 

 your fecond Place of Obfervation* 



Place the Diameter of yoiir Protraftof od 

 F E, with its Center on E ^ prick off 94 Deg4 

 reckon'd from the Weft, or left End of the 

 Diameter, and draw a Line at Pleafure EG. 



The Diameter of the Inftrument being ftill 

 on E F, but its Center on F, prick off 75 

 Deg. reckon'd from the Eaft^ or right End of j 

 the Diameter, and draw F G5 the Interfedion j 

 of the two Lines E G and F G, gives i 

 Point G, the Place of ftanding gf the Wind- | 

 mill. ; 



The Diftance of E G, taken from the Scal6 I 

 by which you let off EFj will appear to be | 

 6 Ch. 35 Li. F G,taken from the fame Scale, 5 

 will he 6 Ch. 55 Li. " 



We by this Time fuppofe the Practitioner 

 tolerably acquainted with the Methods of 

 furveying, protrading. and adjufting the 

 Contents of any (ingle Field 5 aind alfo of fur- ' 



veyingj 



