SELF-CONTAINED, DEEP-DIVING OCEANOGRAPHIC SENSING INSTRUMENT 
Sketchsg 
(To be provided) 
Primary Uses 
This instrument shall be designed for utilization from oceanographic 
survey ships to allow the measurement and recording of certain key 
oceanographic data simultaneously with other underway or stopped opera- 
tions. Emphasis shall be placed on simplicity and rapidity of data 
collection. 
Requirements and Specifications: 
a. For use on oceanographic survey ships with ship stopped ("lying- 
to"). It may also be utilized in multiple drops, all positioned and 
later retrieved by one underway vessel, within a given area. 
b. To be designed as a "free" descent/ascent deep-diving instrument, 
capable of performing reliably to depths of 6,500 fathoms. 
c. The instrument should be designed to sink to any pre-programmed 
depth, at a uniform rate compatible with the time response of attached 
sensors, recording certain key data during the descent. Upon reaching 
the pre-specified depth, a mechanism or weight would be released allow- 
ing the instrument to rise uniformly to the surface, recording the data 
during the ascent. It would then be retrieved by maneuvering the ship 
and hoisting it on board. 
d. The vehicle shall be so designed that it is compact, light 
weight and easy to handle on board ship and in the water. It shall 
incorporate a provision to aid in the vehicle's location upon surfacing, 
day or night. 
e. The following modular data sensors shall be included: (1) tempera 
ture, (2) salinity, (3) sound velocity, (4) oxygan, (5) depth. 
f. The sensor ranges and accuracies desired are: 
Sensor Range Accuracy 
(1) temperature -2°9 to +35°C +0.02°C 
(2) salinity (two inter- 0 to 25°/oo +0.01°/o0 
changeable modules) 25 to 45°/oo +0.01°/o0 
(3) sound velocity 4,500 to 5,500 feet +1.0 foot per second 
per second absolute at readout 
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