Figure 2213. — 500-11). ihciiiiite fxplosion at base of pinnacle. 



in hitting' the icebergs tisiiig these ci'ude an'angeineiits was exjK'ii- 

 eiieed, sufficient liits were made to evaluate the effectiveness of this 

 means of application of carlion black. The l)ombs dropped would 

 botince off the ice and rupture in the aii'. f)ry mixtures were widely 

 dispei'sed withotit achi(>ving an adequate concentration. Licpiid mix- 

 tures formed ineff'ecttuil puddles without achieving an adequate 

 dispersal. 



The second part of the progi-am was accomplished in conjurictioti 

 with the thermite demolition experiments on 10 June. The small 

 tabular berg which had been the subject of the first detonation on 8 

 June was boarded and 25 ])Ounds of carbon black was manually sjjrcnid 

 by fiber brooms. Three persoriS achieved an effective covering of 

 about 6,500 sqtiare feet on one-half of the berg within :W minutes. 

 The sea was calm with a light breeze l:)lowing, the sky was clear, and 

 the time of application was about f530 local apparent time. The 

 elevation of the stm was ap])roxinuitely 45° regressing. Five hours 

 after the application of the carbon black, the berg was obsei'ved to 

 undergo a major calving and breakup. On close inspection the follow- 

 ing morning, the berg was found to be less than a third of its previotis 

 size (see figs. 23a and 23b). 'NMiile the spectacidar afternuith of this 

 test could well be coincident with the inevitable breakup of the berg, 

 the possibility that the carbon black could have been contribtitory is 

 speculative and interesting. Future tests aimed at an op(M-ationally 

 feasible scheme are under sttidv. 



29 



