1 14 Inftrumental InJiruBions 



niore Certainty and Clearnefs, I have illuftra- 

 ted by a Scheme in the next Plate, Fig* 13. 



If you would enlarge your Map, place your 

 lirtle Draught on the Middle of your Paper, 

 -whereon you defign to draw it larger 5 and, 

 fixing upon one common Center, (no great 

 Mavter where, but ibaiewhere in the Middle) 

 and extend the Angles, or radiant Lines, 

 with your black Lead Pencil, every where 

 throughout your Plott ^ as you fee the Lines 

 ABC, &c, are in the 13th Figure of the 

 the next Plate. jrfi Up 



There are CompaflTes to be bought, that are 

 larger at one End than the other, and by that 

 Means moreexpeditioufly perform this Work 5 

 but if fuch are wanting, it is done by altering 

 the Compafles from one Scale to another. 



This, then, is the Method you are to take, 

 after you have extended the RaJws-L.ints: 

 Or you may do it by the Side of the Rule on- 

 ly, without drawing thefe Lines ^ and, as in 

 the E-xample, the Lines A B be ico Foot, 

 Perches, or Chains, or any other Number, 

 drawn on a Scale of 200 or ico to an Inch 5 

 and you are to enlarge it to 50, which is an 

 ufual Scale in Gardening, tho* Learners oft 

 ufe 24 or 30 Parts in an Inch. 



It IS very obvious, how the fame is to be 

 fet off upon that, and all the other Radiant 

 Lines , and by marking the Angles with i, 2, 

 3, 4, d^c. in Pencil, that it may be after- 

 ward rubb'd out, you, when all the Points 

 are laid down, draw the Line. But the whole 



Pro- 



