Abstracts of Technical Articles by Bell Systems Authors

that, for any given class and length of pole, all six species are equal in strength. In calculating these six-feet-from-butt sizes, distance from the butt to the ground line for any given pole was assumed, by definition, to be as shown in the column in the tables headed "Ground Line Distance from Butt." The equality-in-strength principle holds good, however, for any reasonable depth of set required. Approval of the six standards at this time followed a policy adopted by the Standards Council of the American Standards Association in April 1939. At that time the Standards Council decided to withdraw approval of standards having a tentative status, and requested the reconsideration of such standards with the idea of either discarding them or of advancing them to American Standards. Equilibrium Relations in the Solid State of the Iron-Cobalt System? W. C. and E . S. GREINER. There are important transformations in the solid in the iron-cobalt system. One of these originates from the A3 transformation in iron. Cobalt in the binary system at first raises the A3 transformation to a maximum in the region of 45 weight per cent cobalt. Further additions decrease the temperature of transformation which rapidly approaches room temperature in the region of 80 weight per cent cobalt. An extended two phase region from 76.5 to 88.5 weight per cent cobalt was established at 600 degrees Cent. (1110 degrees Fahr.). An order-disorder transition occurs in the alpha phase in the region of 50 weight per cent cobalt.