One system is to number according to the distance from the source.
a number of 2/34 would indicate the second pole or tower in the 34th mile or kilometer from the source.
In communities using the "Hundred Block" system of house numbering, 2/34 would indicate the first pole on the even side of the street.
With hundred block numbering, the poles on the "odd" side of the street are numbered 1,3, 5, etc. The poles on the even side of the street are numbered 2, 4, 6, etc.
Bill
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"Why not the best?"
Jimmy Carter