Hate to tell you bud, I use a string... or, If you can set your corners and run the bottom wire, tight, then mark all your posts, hold the wire out of the way and drill your holes.
an instrument use to construct straight line?
a pencil
ruler
A ruler.
A straight edge or a rule are used to construct straight lines. Laser line setter, In some cases a plumb line
With a straight edge measuring instrument.
A spirit level or a plumb line.
15 tepost
The 1-2-4-7 or the 1-3-6-10 is known as a "picket fence."
The fence cannot be outside your property line.
If the fence is on the legal, surveyed property line, then the line is official immediately.If the fence is not on the legal, surveyed property line, your state's doctrine of mutual acquiescence will determine if and when the fence will become the line. A real estate attorney in your area will be able to tell if you have a legitimate mutual acquiescence claim.
1432 divided by 4 equals 358, which is the number of 4-foot sections of fence. Since the fence must be terminated on both ends, add one more post to terminate the last section. Thus, the answer is 359 posts.