Note. In Practical Surveying, it is necessary to particularize every corner, and on whom each line bounds; which, to avoid prolixity, I omit in this treatise.

In the following Maps, I shall number the bases of the several triangles and trapeziums.

EXAMPLE 3.

The following Notes are proposed, to lay down a Map

of 40 Perches to an inch, and find the Area.

Required to lay down a Map of 20 Perches to an inch, from the following Notes, and find the Area.