riiapter Pa^e 



M. CURRENT MEASUREMENTS— Continued 



Principles of Operation M-5 



Operating the Roberts Radio Current Meter M-7 



Recording Roberts Radio Current Meter Data M-7 



Deternnnation of Current .Speed and Direction M-7 



Maintenance of Roberts Radio Current Meter M-9 



The Woods Hole Oceanographic Institute (WHOI) (Richardson) Current Meter M-10 



Operating the Current Meter M-10 



Maintenance of Current Meter M-1 6 



Geotlyne Current Data Record Analysis M-17 



The Geomagnetic Electrokinetograph (GEK) M-17 



GEK Models M-17 



Isolation Transformer M-20 



Signal Input Leads M-20 



Recording Potentiometer M-20 



The Cable M-20 



Cable Connections M-20 



Electrodes _ M-20 



Operating the GEK Model V M-20 



Maneuvering the Ship for the GEK Observation M-2 1 



Recording the GEK Data M-21 



Reading the GEK Strip Chart M-23 



Cominiting the Current Fix M-24 



Securing the GEK M-24 



Maintenance of the GEK M-24 



N. UNDERWATER PHOTOGRAPHY N-1 



General Remarks N-1 



Underwater Cameras N-1 



Camera (EG&G Model 204) N-1 



Light Source (EG&G Model 214) N-1 



Battery Pack (EG&G Models 280 and 281)__ N-1 



Mounting Rack N-1 



Sonar Pinger N-1 



Instructions for Assembling Mounting Rack N-4 



Checkout of the LTnderwater Camera System N-5 



Pre])aring LTnderwater Camera Components for Installation on Mounting Rack N-5 



Positioning Underwater Camera Components on Mounting Rack N-6 



Electrical Connections Between Components N-6 



Other Camera Systems N-7 



Immersion of the LTnderwater Camera System N-7 



Bottom Positioning Techniques N-9 



Emersion of Camera and Removal of Film N-9 



Processing of Film N-9 



Selection of Film N-9 



O. BIOLOGICAL SAMPLING 0-1 



General 0-1 



Biological Sampling Nets 0-1 



Qualitative Plankton Sampling Net 0-1 



How to Operate the Qualitative Plankton Sampling Net 0-1 



Maintenance of the Qualitative Plankton Net 0-1 



The Clarke-Bumjius Quantitative Plankton Sampler - 0-1 



Assembling and Operating the Clarke-Bumpus Sampler 0-3 



Maintenance of the Clarke-Bumpus Sampler 0-4 



The Midwater Trawl 0-4 



Assembling the Midwater Trawl 0-5 



Streaming the Trawl 0-5 



Towing the Trawl 0-5 



Retrieving the Trawl 0-5 



Additional Instructions 0-5 



Removal of vSpccimens 0-6 



Maintenance of Midwater Trawl 0-6 



Benthos Sampling 0-6 



Change 1—1970 ix 



