needs of the program. The instrumentation 

 had not proved satisfactory either. Fortunately- 

 most of the equipment was recovered by tuna 

 fishing vessels. 



It was then decided to redevelop the nnooring 

 assembly and much of the instrumentation. 

 Because of reorganization of staff this work 

 did not get underway until April 1959. Its 

 status on June 30, I960, to be described below, 

 was that new equipment existed and was under- 

 going tests in southern California waters. 



The foregoing observations refer to a type 

 of station capable of measuring and recording 

 conditions in the near- surface ocean and at- 

 mosphere, where we think that most of the 

 information needed in tuna ecology can be 

 obtained. Although the hopes of most of the 

 program investigators are therefore centered 

 upon this type, some attention has been paid 

 to another type in which the interest is in 

 measuring temperature throughout the water 

 column for the purpose of investigating in- 

 ternal waves. This requires a special kind 

 of mooring which could conceivably be useful 

 in other situations, if it proves successful. 



In the following sections these three types 

 of moored stations will be discussed sepa- 

 rately. They will be called A, B, and C 

 respectively for the original general-purpose 

 station, the redesigned general-purpose sta- 

 tion, and the station for the investigation of 

 internal waves. 



No attention has yet been given to the telem- 

 etering of observations, although this will 

 eventually be necessary to make the stations 

 useful for routine forecasting work. 



Because of the complexity of the equipment 

 there is a vast amount of detail that could 

 be given, but much of it is unnecessary for 

 the purpose of this report. The following 

 sections indicate the main features of the 

 three types of equipment, with the main 

 emphasis on the mooring system because this 

 was the main area of difficulty, and the 

 results of tests conducted with them. 



Since this report was first written, the 

 type B station was put into operation in 

 California and Baja California waters in early 

 November 1960, and worked very satisfactorily 

 through December. 



All of this work has been supported in 

 part (75-80 percent) by the Office of Naval 

 Research. 



Moored station type Af^. 0. Isaacs, J. L. Faughn, 

 A. L. Nelson, and C. D. J ennings).-- The essential 

 features of the hull and mooring are available 

 in publications cited above. The most detailed 



published figure of the mooring assembly is 

 that of Egeberg (1959) although the hull he 

 describes is not the one used in the work 

 described here. Figure 3 includes a diagram 

 of the station for comparison with those of 

 types B and C. 



A simple description of the instrumented 

 station assembly as used on the STOR pro- 

 gram is as follows: 



Each station consisted of a l6-ft. fiberglass 

 skiff, decked over and painted orange. A 300-ft. 

 painter (sometimes nylon rope, sometimes 

 plastic-coated stainless steel cable, bearing 

 plastic line floats) attached the bow of the 

 skiff to a submerged spherical float (about 3 

 ft. diameter) approximately 150 ft. below the 

 sea surface. This float was anchored to the 

 sea bottom with a steel cable of diameter 

 0.123 or 0.200 in. An electrical cable 390 ft. 

 long, bearing thermistors at intervals and a 

 pressure-sensing element at its free end, 

 was suspended from the stern of the skiff. 



Mounted on the skiff was a short mast carry- 

 ing an anemometer rotor, an elennent for 

 sensing air temperature, an orange flag, a life- 

 boat-type radar reflector and white flashing 

 stroboscopic-type light intended to be visible 

 at 50-sec. intervals at a distance of 4 miles 

 in clear weather. A wind vane mechanism was 

 mounted on the after deck. 



Instrumentation inside the skiff consisted of 

 a compass element (for identifying wind direc- 

 tion), batteries, and a Streeter-Amet print-out 

 counter-recorder with 10 channels of informa- 

 tion. 



The thermistors were arranged to sense 

 sea temperature at 0, 20, 40, 70, and 120 m. 

 when the instrument string was vertically 

 suspended. The pressure signal from the end 

 of the string was intended to show deviation 

 from vertical from which estimates of actual 

 depth of the temperature observations could 

 be made. 



Magnesiunn-carbon sea-water batteries 

 (6-12 volt) were used to power the stations 

 moored in June 1958. Commercial lead-acid 

 storage batteries were used on the stations 

 moored in November 1958. 



The sensing-recording system worked di- 

 rectly from the voltage. It consisted of a 

 single vacuum tube blocking oscillator with 

 pulse rate proportional to the resistance in 

 the grid circuit. The pulses were fed into a 

 counter-printer and counted over a fixed in- 

 terval of time, and the total was printed on 

 paper tape. The parameters being measured 

 were caused to produce changes in resistance 

 or to produce pulses directly. The timing 



