data was obtained while on anchor station. 



Wave data were obtained using the "Splashnik" , developed by the David 

 Taylor Model Basin, as the basic sensing element. The system consists of 

 a buoy assembly containing a transducer and transmitter, a wide band FM 

 receiver, an electronic low pass filter, and a recorder. The transmitter 

 emits a signal that varies in frequency proportional to the acceleration 

 imparted to the buoy assembly by wave action. This signal is received by 

 the antenna mounted on the ship and is fed into a receiver. In the 

 receiver, the frequency changes are converted to a varying dc voltage 

 which is proportional to the acceleration. The dc voltage is placed on 

 the input of an adjustable low pass filter which cuts off the signals 

 produced by the surface chop of the sea, but passes unaltered the lower 

 frequency signals produced by the larger and longer waves. The output of 

 the filter unit is then recorded on magnetic tape. Figure 6 shows the 

 float assembly, or "Splashnik", of the wave height telemetering buoy 

 system. 



Oceanographic casts, using the Nansen bottle and paired reversing 

 thermometers, were made for obtaining water samples in order to compute 

 density. 



Meteorological data were obtained using standard equipment, as well 

 as time-lapse photographs of cloud cover. Wind measurements were made 

 at three levels. 



III. INSTRUMENTATION TEST AND EVALUATION 



A. ELECTRIC CABLE REELS 



Installed aboard the survey vessel were two models of newly -manufac- 

 tured electric cable reels of 12,000 and 2,000 foot capacity, respectively. 

 Figure 7 shows the smaller cable reel and winch. These units, designed to 

 operate with electrically conductive cable (six conductors) , offer infinite 

 speed control in both powered lowering and hoisting positions and have the 

 advantageous feature of rapid interchangeability of the reels. Approxi- 

 mately 30 lowerings were made with the smaller unit, utilizing two models 

 of electronic bathythermographs. Operation was found to be smooth and 

 trouble free. In addition, since there was no universal connector for 

 both BT's, drums were changed daily. This operation was performed in 

 about 10 minutes with insignificant delays in data acquisition. 



B. ELECTRONIC BATHYTHERMOGRAPHS 



Two models of an electronic bathythermograph, the WHOI Subaqueous 

 Temperature Probe and the HYDRO Linear Thermistor System were tested during 

 this period with excellent results. Briefly, both consist of a dc 

 pick-off and self balancing resistance bridge circuit with a thermistor 

 sensor as the variable leg. This was the first deepwater test of these 

 instruments, both of which have a 600 psi (1350 foot) depth limitation. 



