. none: (oontimued) taking advantage of the telemetering already existing at big stations all over the world. Measturing the conductivity would be one way of doing it. The other obvious way would be te measure the radioactivity. That is, by some method of Geiger counters properly crianted so ss to eliminate ocanic Yadiation as auch as possible. From whet I have been sable to gather, it is cut of the field of the second, that is, the direct Geiger counters, a little bit out of the field ef ou specialty - but it would appear to be rather herd to do. It involves quite a lot of instrumentation. We beve Looked inte the question of measuring the conductivity in the Upper atmosphere, and it appears that this could be done vith fairly reasonable equipmtat, and it also appears that there is going to be a very large change in the comiuctivity wherever wo have changes in the radicactivity. This will ocme out this afternoon, perhaps, when we give a few facts and figures about the atmospheric ion content in a radicactive cloud. BOE ARCHIVES