PART V - SUMMARY OF OPERATIONS (CONT) the additional inset of the O1 deck, results in inadequate clearance when handling the 170 lb. underwater fish. It only requires a 30 roll for the fish to strike the hull when it is being raised or lowered. Although fairly well protected by a stainless steel framework circled with solid rubber bumpers, the sensitive electronic components undoubtedly suffer from the occasional impact received when hitting the ship. The failures referred to above may have been attributable to this cause. (b) PDP-8S Computer. 1. The PDP-8S computer and the ASR-33 teletype I/O unit satisfactorily completed all the data processing for which it was scheduled. This included correction of reversing thermometer temperatures; density, sound velocity, and dynamic height anomaly calculations from STD obtained data; calculation of chemical concentrations (oxygen, nit- rates, nitrites, phosphates and silicates), preliminary conversion of fluorometer readings to chlorophyll and phaeophytin concentrations; calculation of distances between stations from positional information; and conversion of conductivity, as measured by laboratory salinometer, to salinity. However, the operation of this equipment was erratic and required excessive operator time. During the first three weeks of operations difficulty was encountered in getting the computer to operate at all. Program tapes fed in through the slow speed reader functioned normally at times, and at other times not at all. When program tapes did feed in, the computer worked well sometimes for an hour or two at most, then stopped and would not restart, or even read in a program tape. Repeated attempts to get it going failed; high room temperature was suspected, as were the voltage regulator and the cooling fans. After trying various combinations of room temperature, voltage regulator on or off, and fans on or off, the problem somehow eliminated itself for no known reason, and for the remainder of the cruise operated with inter- mittent temporary failures. (c) Hydrographic Cable. Immediately prior to this cruise the 3/16" stainless steel 7x19 hydrographic cable was replaced with a newly developed, three stranded, torque-balanced wire rope. It is identified as United States Steel Tiger Brand 3/16" stainless steel 3x19 wire rope. Its claimed advantage is greater strength and increased resistance to abrasion and wear. These qualities could not be evaluated except that it is noted that there were no failures and no fish hooks or kinks have developed. Service experience with this cable is considered to be sat- isfactory, however, the following drawbacks are noted: a. Due to the wire's three strand construction and non-circular cross-section, it did not spool as well onto the winch drums. b. It deeply grooved the sheave and cheeks of the fairlead block. Also, it cut several leather arm protectors to ribbons. c. Its cross-section caused the Nansen bottles to "hang up" on the wire strands. To remedy this the retaining grooves on the Nansen bottle clamps had to be widened.