merit consisted of a power supply, preamplifier, counting circuits, 

 analog recorder, and towed sensing unit. The sensing unit, a 

 Varian Model X-49-813 using 700 feet of Simplex #310 two-conductor 

 cable, was towed 400 feet astern. This sensing unit was streamed 

 and recovered manually. Console electronic equipment was installed 

 in the drafting room on the after part of the ship. Data were 

 recorded In analog form on a Varian G-11 recorder in units of "mag- 

 netometer counts". These units, an inherent property of the magne- 

 tometer design, are an inverse function of the total magnetic field 

 intensity. In the survey area, one magnetometer count is equal to 

 approximately 1.3 gammas. 



Bathymetric instrumentation aboard the PREVAIL consisted of an 

 Edo AN-UQN-lB sonar receiver -transmitter, the output of which was 

 recorded directly in fathoms on a Mark V Precision Depth Recorder 

 (PDR) . This type of recorder can be read to the nearest one fathom. 

 The bath3nnetric recording instrumentation was located In the ship's 

 drafting room. 

 D. Personnel 



Two geophysiclsts from the Geomagnetlcs Branch, U. S. Naval 

 Oceanographlc Office installed and operated the magnetometer system. 

 PREVAIL personnel operated the bathjrmetric Instrumentation. 



