COLLAPSE OF TEXAS TOWER NO. 4 205 



Mr. Brewer. That is correct. 



Senator Saltonstall. In the whiter of 1957 and 1958 or 1958 and 

 1959? 



Mr. Brewer. 1958 and 1959, right. 



Senator Saltonstall. Did the motion increase, from November 

 1958 to March 1959 ? 



Mr. Brewer. It seemed to be primarily related to the sea height, 

 that is, we have a plot — I can quote that — we have a figure wliich, I 

 think, illustrates it better than words. 



We have plotted tower motion against wave height, and throughout 

 this period you will see this, that there is a correlation here between 

 the motions of the tower and the height of the waves that were im- 

 pinging on the tower, and from that you will also see that the waves in 

 the 10- to 12-foot category had almost or as great an effect as the waves 

 way up in the 30-foot category because of the simultaneous loading 

 of the legs which I mentioned earlier. That, for the record, is our 

 figure 17, in report 173. 



Senator Saltonstall. Did you give an opinion to your employer, 

 the Hallicrafters Co., that the tower was safe or unsafe, from your 

 observations ? 



Mr. Brewer. I am not sure; I don't believe we gave any opinion as 

 to that. I think we merely said that the stresses that we measured 

 above the deck were moderate at that point. 



Senator Saltonstall. So that from your observation and examina- 

 tion, in terms of your employment, you had no opinion as to '.whether 

 the tower was unsafe for the purposes for which the Air Force was 

 using it, during your examination or afterward ^ 



Mr. Brewer. Well, we had no opinion on it because we don't know 

 the conditions beneath the sea. The stresses beneath tlie sea could be 

 very materially higher than those we measured above. 



knowledge of conditions of subsea braces would aid above- water 



study of stresses 



If some of the bracing was gone, and if someone could tell us 

 exactly what braces were gone or what the structure beneath the sea 

 was, we could then make some rather accurate calculations of wliat the 

 stresses were, and they could be very appreciably higher than those 

 we measured above. But this is contingent upon an exact knowledge 

 of the subsea structure, and we never had that knowledge. 



Senator Saltonstall. Were the stresses excessive at any time, in 

 your opinion, at the maximum of tlie 10- and 12- foot waves which 

 were causing the most motion of the platform ? 



Mr. Brewer. They were not excessive where we were measuring 

 them; no. 



Senator Saltonstall. So at the point where you measured the 

 stresses on the legs and bracings and while you were measuring them, 

 the stresses were never at any time excessive ? 



Mr. Brewer. Well, they could be underneath the sea. 



Senator Saltonstall. I see. 



Mr. Brewer. We don't know what is going on beneath the sea, 

 sir ; you see, that is our problem. 



