INTRODUCTION 



The symbol — placed above the sounding figure signifies that no bottom was reached at that 

 depth, and an asterisk following the depth indicates that the figure was obtained by echo-sounding. 



Some of the bottom deposits off the South-West African coast emit a characteristic smell of 

 hydrogen sulphide, and where this occurred H 2 S has been placed beside the appropriate abbreviation. 



The state of sea and swell is expressed by the appropriate number in the Douglas Sea and Swell 

 Scale, which is as follows: 



Sea Swell 



o Calm o No swell 



i Smooth i Low swell, short or average length 



2 Slight 2 Low swell, long 



3 Moderate 3 Moderate swell, short 



4 Rough 4 Moderate swell, average length 



5 Very rough 5 Moderate swell, long 



6 High 6 Heavy swell, short 



7 Very high 7 Heavy swell, average length 



8 Precipitous 8 Heavy swell, long 



9 Confused 9 Confused swell 



The following Beaufort notation has been used to express the state of the weather : 



b blue sky with clear or hazy atmosphere, or sky not more than one-quarter clouded. 



be sky between one-quarter and three-quarters clouded. 



c mainly cloudy (not less than three-quarters clouded). 



d drizzle or fine rain. 



e wet air without rain falling. 



fe wet fog. 



m mist. 



o overcast sky (i.e. whole sky covered with unbroken cloud). 



p passing showers. 



r rain. 



z dust haze ; the turbid atmosphere of dry weather. 



The times of the observations are given in. ship's time expressed on the 24-hour system ending 

 with midnight (0000). The hours to be added to, or subtracted from, ship's (or zone) time to give 

 GMT are noted in the ' Remarks ' column, this difference holding good until another entry is made. 

 For example at Station WS 964, " GMT=zone- 1 hr " means that one hour is to be subtracted from 

 ship's time to give GMT. Times in heavy type refer to biological observations made between sunset 

 and sunrise. 



The following symbols are used for nets, apparatus, etc. : 



B Oblique. 



BT Bathythermograph, standard U.S. Navy pattern, OC 2A/S, manufactured by Wallace and Tiernan 



Products, Inc., New Jersey. 



DC Conical dredge. Mouth 16 in. (40-5 cm.) in diameter, with a canvas bag. 



DLH Large rectangular dredge. Heavy pattern, 4 ft. (1-2 m.) long. 



H Horizontal. 



KT Kelvin sounding tube. 



LH Hand lines. 



LL Long lines (a fleet of two lines, each 460 fathoms long). 



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