fhe PraBke Part IL 



Iicix- Angle defcribe with the Compaffes air- Arcfi^ a^ 



which joins the two Sides of this Angle, and meafure the 

 Diftance oF the two Points ^and r, fuppofed' four- Fathom,^ 

 which is call'd the Cord of the Arch ^and c. Then mea-- 

 fure upon the Line tracqd upon the Ground^ eight Fathom as 

 from^ toB^ and taking, a Line of four. Fathom, the Loop, 

 of which is fixed to the Stake and another of eight Fa-- 

 t}K)m fixM in lik^ manner to the Stake join them togetheir 

 at the Point where drive a Stake after which ■ you draw^ 

 the Lines C5 and C which, with the traced Line A B^^ 

 make the Angle B AC eq^ual to,the Angle of the Plan. 



THE TENTH PR A G TIC E^ 



draw ^ with the In^Yimient^ an Angle equal tQ an^Ahgle- 

 ghen upon the Plan^ 



Measure the Angle marked' upon the Plan with the 

 Ml-.G. X. Protraftor, by placing its Corner upon the Point ^3, and its. 



Bafe along the Line a count how many Degrees there are 

 fi'om c tod 'i as fuppofe thirty, keep- this Number carefully 

 in mind, that it be fet off exaftly upon the Groxtnd, in fup- 

 pofing A S the tracedLine, and the Point E: that from whieh 

 is to be drawn an Angle equal to that of the Plan. Set the 

 Center of the Semi-circle as perpendicularly as poflible over 

 the Point and direftihg the Bafe to the Staked, place 

 the Index at the Point C, upon the fame Degree that you 

 found upon your Paper with the Erotraftor, ^ and by the 

 Sights of the Index caufe a Sxake to be planted' towards D^. 

 and draw the Line B D^ by either of the two firft Pradices^,. 

 as Ueftfuits with the Diftance contained between BtmdD;, 



THE ELEVENTH PRACTLCE./ 



"io draw^ with the Line^ a Triangle equal to a Triangle 

 ginjen upon the Flan.. . 



Let the fuppofed'Triangle be abc-^- meafure each of its 

 EI G. xr. Sidfes, and note them upon the Plan, then- drawing the Bafe 

 4B^ found^ for-Inftance^ to be.ten-Fathomi- take a Lme 



