(continued) taking advantage of the telonetering already existing big atations all over the world. would be one way of doing it. Measuring the oo The other obvious way to measure the radicactivity. That is, by sone method Geiger ocunters properly crimted so as to elininate co radiation ag wuch as possible. From what I have been to gather, it is out of the field of the second, that is] the direct Geiger counters, a little bit outof the field ofjour specialty - but it would appear to be rather hard to do] It - involves quite a lot of instrmentetion. We have looked into the question of measuring the conductivity in the feirly reasonable equipstat, and it alsoeppears that going to be a very large change in the conductivity we have changes in the radioactivity. This will come this afternoon, perhaps, when ve give a fev facts end about the atmospheric ion content fn a radfoactive cloud] we 0 4 ~ALLOGGs Powe 7 - /3/