of Terr ACE- Walks. 17 j 



place our Boning Staves, before defcrib'd, a- 

 boutfour Foot and an half long ^ and at the 

 End of the hypothenufal Line, at B b, fet up 

 a 20 Foot Rod, and place Jt fexadly upright, 

 by holding a Mafon's Piuo]b-Rule to the Side 

 thereof^ and as you have already found, 

 that your Perpendicular muft be. 14 Foot, you 

 are therefore to tie a Piece of white Paper on 

 your twenty-Foot Rod, at the Meafure of i8 

 Foot and an half, (by which you allow 4 Foot 

 and an half for the Length of your Boning 

 Staff) and when the Paper is level with the 

 Heads of your two Boning Staves, you may 

 then conclude you are right 5 but you muft 

 obferve one Thing, v'ls^, when you apply 

 your Hypothenufal a b to your twenty-Foot 

 Rod, and find you are to fink two or three 

 Foot deep into the Ground, you muft be fure 

 to make an Allowance, elfe you will over- 

 run your Hypothenufal or Slope Line. 



This Point being determined, it will be ve- 

 ry eafy to meafure out, according to the Na- 

 ture of your Hill, the Width of the next 

 Flat, which, in my Defign, is 37 Foot ^ from 

 the Extremity of which you are to repeat the 

 fame Procefs as you did in the other Slope, 

 having in this Flat made a fmall Allowance 

 for the Hang of it, in order to the carrying 

 oflF the Water, which Hang may be about an 

 Inch in 10 Foot, or fomething more 5 fo that 

 in this it may be about four Inches 5 and if it 

 were 6 or 8, it would ftill be the better, and 

 would in fome fmall Meafure help to take the 



great 



