ge l. 2-32 To determine the time interval between primary and secondary of two stage devices by measurecment of the electromagnetic signal. 2. To study the electromapnetic signal in order to determine the mechanisms by which the verious stages of the signal ere produced. Techniques: 1. The electromagnetic signals accompanying tuclear detonations were by an antenna and recorded on fast oscilloscopes. Results: 1. The results of this program ere given in the individual project report. 2.2.10 PRCGRII 18 ae 7. rice a