44 Numerical InflruElions 



47 6 



Of the general Ufe of Triangles^ in meafuring 



all ft rah lind irregidaj' Plans, 



(Figure the 7th, Flare the 23d.) 



It muft be here obferv'd, that a Triangle 

 meafiires all irregular Plats, either large or 

 fmall, by reducing the whole Piece into Tri- 

 angles, which Triangles are one of the three 

 Kinds lafl mentioned, and muft be fo inea- 

 fur'd. 



Suppofe that Fig. the 2'jth^ Plate the 2^cJ^ 

 be an irregular Plan, with ftrait lin'd 

 Sides and Angles ( for as for circular or 

 crooked Sides, it is taught in Fig. 2. Plate 23.) 

 that is to be meafurM in order to be levell'd, 

 or any other Work common in Gardening, 

 and reduced into Feet, Inches, &c, and after 

 that into Yards, fuperficial, or folid, or into 

 ftrperficial Perches 5 not taking any Notice in 

 this Place of large Land-meafure, that being 

 to follow Chapter of Inftruments, 



Having 



