at this site and quite often lack of sufficient data to define the initial part of 

 the load— displacement curve. These problems prompted the development 

 of the strain gaqe type load transducer and the FM telemetry system. 



Figure 2. In-situ plate bearing device. 



The second cruise to the Series 1 1 1 site was conducted aboard a Navy 

 YFU primarily for the purpose of proof-testing the new load transducer and 

 telemetry system. During this cruise tests SC-13 through SC-16 were performed 

 resulting in the conclusion that the acoustic projector and receiving hydrophone 

 were too directional to meet operational constraints. It is necessary at times 

 to operate with the support vessel in a drifting mode. For practical purposes 

 this requires the ability to receive the acoustic data signal when the receiving 

 hydrophone, and therefore the ship, is laterally displaced from the device a 

 distance not exceeding the water depth at the test site. At this distance the 

 wire angle would be 45 degrees, the maximum allowed in order to avoid over- 

 turning the device upon retrieval. It was found during these tests that the 

 signal was lost after the vessel drifted a distance of only about one-half of 

 the water depth. To solve this problem a revised acoustic projector and hydro- 

 phone set were procured. 



