Discussion on “the design of telephone pole lines for conditions west of the Rocky Mountains” (Griswold) Portland, Ore., April 17, 1912. (see proceedings for May, 1912)

H. Y. Hall: I ask Mr. Griswold what has been the experience of the telephone companies in the use of concrete particularly, and what has been the effect of the use of concrete on the butt rot. That is, under the weather conditions, applied under similar conditions that exist in the west, and also in the different soils. The paper states “It is the practice to allow the pole to reach approximately a safety factor of one before replacing.” Would that apply to all the poles in the line, or to just an occasional pole? I take it that would be rather unsafe to apply a factor of one to a whole line of poles; you might to an occasional pole.