ON LANDSCAPE GARDENING. 



lengths of the perpendiculars dc, fe, hg, &c, erected on the 

 straight lines ac, ae, and ag. From the point a, situated on an 

 eminence, the worker could see all the different points of the 



Fig. 4.— Tracing a Curve by Cheminement. 



curve, whereas, if he were standing in a hollow of the ground, 

 one part would be hidden. 



By the second method the curve is traced by what is known, 

 in French, as cheminement, and differs from the first in that the 

 operator, instead of directing the work from one point, goes 

 forward as it proceeds. It is based on the principle that 

 if the perimeter of a circle is divided into equal parts the 

 abscissae are all equal to each other. In Fig. 4 the curve is 

 equally divided in a, c, e, g, and i ; the abscissae of the chords 



F IG . 5. — Tracing a Parabolic Curve. 



Ac, ae, and eg will be equal to ba, as all the arcs of the circle 

 are equal to each other. Starting at the point A, the operator 

 has the pegs at a and c inserted, and notes the length of the 



