| =U CHORE — — ef "ft sweeping the fireball, which may be the case here " the fireball to be completely obscured with respect to the spectrometer. In other words, the spectrometer will be looking through a shock wave and the fireball has been completely swept by the shock wave. This effect should occur somewhere within a half angle of about 30° from vertical. In other words, the shock wave if it sweeps through will sweep about the distance of half a fireball radius. Since Dr. Plum mentioned the light source, we had the opportunity of other speakers being able to see J=-6 before I got on the platform, and what we had proposed to do was put a 10 to the &th luminant source, which would be essentially a one pi source facing toward the land station of Dr. Plum and the aircraft. However, J-& tells me that the diagnostic people wuld object to having a source of this intensity, at time zero and that the requirement would be that the source would have to be turned off about 5 minutes before, The power requirements for the source are about 7000 volts at two amps, and we intend to put a calibration at the source and we would like to have a channel to transmit this information along the other signal cables that are available, If we have such a source, we would then have absolute transmission measurements, both to the spectrometer at time zero and also in the 5.8 airplane. We would like to put in a narrow beam transmissometer in view of the fact that the calorimeters themselves are not sensitive enough to pick up the light source. We have no construction requirements except for putting up the light source, if we are permitted to do so, The number of people we intend to have are four people associated with the project. we would like to put the light source as close to GZ as possible ~ 50' or 50 yards, as close as will be tolerated.