1 2 Geometrical InflruSlions 



. PROPOSITION I. 



§ B.Tt) elevate a Vevpendiadar atajtyPoiTttofaLinf, 

 partk-tihrly the Middle and the End, 



TJje Vvacrice 07t Paper mj the Middle^ Fig. i . 



From the Point given C,toudi the Line in D and E, 

 T^/Wtom the Point D E, make the Sedlion I. 

 i By which' Means, C I ihall be the two Points 

 whtreb}^ the Line is to be drawn perpendicular. 

 The fame oji the End of the Lhie^ Fig. 2.- 



From the Point A, drawthe'Arch G, H, M. 

 _ From the Point G, draw the Arch A H. 

 •' From the Point H, draw the Arch M N. 

 c ' From the Point M, draw the Arch H N. 



Then draw the reqnir'd Perpendicular A C. 

 - There is not Occafion on Paper to make all thefe 

 Arches \ for which Rcafon I have put down Fig. ;. 

 to fhew 3rou how to avoid it, as the other is to 

 explain it. -'"^ '^ ' . ' ' 



Fig. 4, is another Way which almoft explains it 

 ifelf, and the fifth are the Lines fimply confider'd. 



The Pra&ice on the Gromid. 



A Garden Line very plainly "eifeds the fame on 

 the Ground, as the Compaffes do on Paper-, but 

 our beft Method is our Gayden-Square, which apply'd 

 to any Line, fets off a Perpendicular, as is evi- 

 dent by the Practice, Fig. 6, 7, 8. 

 ' But in cafe a Square is wanting, a Mcafure of 

 eight and fix Foot with a ten Foot from one End 

 to the other, makes a good Square, as may be feen 

 in Fig.. 9. and it is by this tliat all right-angled 

 Figures are fet out in Gardens, and all other 

 Works. 



It is particularly by this, that all middle Lines, 

 and grand Avenues and Walks, are fet out from a 

 Houfe, &c. 



