———_— This system was developed primarily for the weapons test and it soon became fairly obvious that this was not an ideal system or technique for the Civil Defense work because they would heave to go out and take a look at the large areas of fallout to determine what measures had to be taken for emergency, what supplies had to be brought in. Our first accociation with that problem was operation alert, last June, where we undertook to send information froma New York to Boston, © What we did was, we took the fallout pattern which was described for New York and we reproduced this pattern on regular recording tave, using the type of elignal letters put out by our information etation. Then, when Operation Alert came we put this information right into a telephone line and sent it up to Boston. In Bocton we have thie central station (indicating) and what we did was to take the data as it ceme over and plotted the iso intensity lines that had been laid down for the New York area.. I don't know whether you can see this, but I'11 give you an idea of what it looks like. I am going to give you this ——— 146

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