os oe @ Lilie The yredicted time of arrivel curve was amply verified in « novel manner on KING shot. Due to « failure of several cameras used to establish the § actual burst coordinates, there was considereble interest in confirming the coordinates subsequently established hy other cameres. The time of arrival } measurements by Sandia over two blast lines furnished such @ confirmetion, 4 and accordingly, a “predicted” tine of arrival va. horizontal distance curve 4 was deduced by mmerical integration, using the hatght of burst curves fron 3 LA-1N06, ite tine of arrival for free air, the fireball yield, and the in- 3 tended height of burst. With this curve, and the observed time of arrival, 3 the burst position could be plotted as lying on a circle about cach station. 3 Yrom the intersection of these circles, from various stations, the actual rf position could be plotted, ‘the method is af course poor, because the arcs ; of the circles are nearly paraliel, and an extremely high degree of accuracy ; is regrired in the time of arrival curve. Monetheless, the burst position, ’ as plotted from tine of arrival, in in excellent agreement vith the burst 2 position from surveying cameras. Conversely, it also means that the pre- | dicted time of arrival curve will be confirwed as closely as cme can read . the graphs. This agreensnt is further gratifying because the prediction z * involved the height af burst curves, and because of the fundamental nature 5 om At 4 4 a 83! 1 of the time of arrival curve to hytrodynanic theory, BEST A VAILAGLE C 7 A camera station bad been improvised on Rmit to observe the therm. effect photographically over verious types cf surfaces, and in purticular, to 2 photogragh @ thermal blowup or the precursor action resulting from it. Fussel E : of BGM reports that two out of three of the records were probably lost because a : tha photographic filters were burned by therm) radiation. A preliminary view Es of the third camera indicates a thermal blow-up, but the precurscr shock, if e x any, was probedly obscured by pre-shock dust and smoke. -- Ih view of Sandia's .