APPENDIX II 



INSTRUMENTATION FOR MEASUREMENT OF TEMPERATURE PROFILE 



INTRODUCTION 



This section presents the design of an electronic instru- 

 ment system for continuous temperature recording at each of 

 a large nvimber of points along the 6000-foot cable of the 

 tov?ed system described in the preceding sections of this 

 report. The purpose of the detailed design is to provide an 

 embodiment of the basic concept of the deep-towed vertical 

 chain of sensors, first, as a demonstration of feasibility 

 and, second, as the preliminary design of a practical instru- 

 ment system for obtaining data of primary interest in oceano- 

 graphy . 



A towed, vertical-profile, temperature-sensing chain, 

 currently in use by Woods Hole Oceanographic Institution, 

 is described in (2), It contains 22 thermistors equally 

 spaced along its 900-foot length. The cross-sectional area 

 of the faired chain is large enough to accommodate separate 

 electrical leads connecting the thermistors to the shipboard 

 sampling and recording apparatus. 



By contrast, the present system calls for one hundred 



or more measuring points spaced along 6000 feet of cable, the 



cross-sectional area of which is sufficient to accommodate 



only about twenty electrical leads of reasonable size and 



insulation. 



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