— 49 _ 450 time for the first few hundred feet (about 500 feet in this case), and then fer several hundred feet, the increase in shook velocity sccompany~ ing Nach stem formation mast be considered; for the remainder of the path, the reflection factor is used. When the path length in great, there is no advantage in using this involved procedure, owing to the wcertainty apout the reflection factor, Yields ebtained using reflection factors of 2 and of 1.6 over the entire path length are given in Table 10.21. TABLE 10,2-1 Range Parry 8,593. 1739 49) Arrival Tine ss Baie 12,727 eT? 23 . verage YIELD, KILOTONS) YIELD, KILOTONS Meret Pastor Refleetion Pastor é© XS rr] < 40 &