. The Bell System technical journal . Fig. 13—Apparatus for the accelerated test. In order that the contacts recorded by the accelerated methodshould be comparable in definition to those recorded by the naturalwind method, the wires used in the accelerated test were connectedto the same recording apparatus as was used in the natural wind tests. From the results obtained through the use of the acceleratedmethod of test an empirical equation was developed for the case of apair of wires with equal sags. This equation (6) is given in AppendixII. The comparable empirical equation (5) for natural wi
. The Bell System technical journal . Fig. 13—Apparatus for the accelerated test. In order that the contacts recorded by the accelerated methodshould be comparable in definition to those recorded by the naturalwind method, the wires used in the accelerated test were connectedto the same recording apparatus as was used in the natural wind tests. From the results obtained through the use of the acceleratedmethod of test an empirical equation was developed for the case of apair of wires with equal sags. This equation (6) is given in AppendixII. The comparable empirical equation (5) for natural winds, referredto above, is also given in Appendix II. With these two equationsit is possible to determine the expected natural wind threshold velocitiesof a wire arrangement through the use of the accelerated method oftest. An equation (7) for this use, which was obtained from theabove two equations (5) and (6), is also given in Appendix II. While empirical equations were developed only for the case of a TELEPHONE LINE WIRE SPACING
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