iron lines. The spectral cutoff is given as 3450 A. No intensities or temperatures were measured here because of overlapping. (Tumbler-Snapper 1 is essentially the same.) 4.7.2 Tumbler-Snapper 3 (30.7 kt, Airdrop, Total) AlO appears in emission. Barium and aluminum appear in absorption. One of the barium lines (4934 A) appears to show self-reversal with a broad emission shape. Iron begins at 4000 A and appears above this in emission. Calculations of the quantity of vibrationally excited O; and Nf are given in relative terms. From a comparison of this with other shots, there is an indication of the scaling of the quantity of these with variance of yield. Rotational temperatures were calculated, and the best value seems to be about 2500°C. 4.7.3 Tumbler-Snapper 4 (19.2 kt, Airdrop, 0.6 to 5 Sec) Iron covers the whole 4000 to 6000 A region in emission. Barium appears in emission as does AlO. This was not a good plate for line measurements; thus no temperatures or quantities of absorbers were calculated. Nf and probably NO, are seen in absorption. - 4.7.4 Mike (10,000 kt, Surface, Total Time) O(I) and N(I) appear in absorption. No casing material shows. Nf is surprisingly not very evident, but the production of excited O, molecules for the S-R absorption is increased beyond that in the lower yield shots. NO, appears fairly prominently. The high cutoff value here could not be measured accurately because of plate fogging, but it can be stated that it is at a higher wavelength than for any shot measured up to the present. It seems to lie around 3800 A. 4.7.5 King (540 kt, Airdrop, First Maximum and 0.1 to 1.1 Sec) Casing material does not show here. O(I) and N(I) appear in absorption. The wavelength of the cutoff in King (1.0 to 1.1 sec) seems higher than in Tumbler-Snapper 3, an exact measurement being impossible. A higher cutoff would be consistent with a greater production of absorbing material. From the data for King (1.0 to 1.1 sec), a rather high rotational temperature of about 9000°C was obtained from an S-R band. This is a very rough value. This temperature seems high for this time which is beyond breakaway. Some caiculations of the relative amount of absorbing material were made, and these show the trend of a moderate rise with increase of yield. ° 34