'
236
Glossary
,
SA‘I‘URATION DIVING: the diver remains at or near the working depth after
"“ÏŸ
his body tissues have become satürated With the inert gas of his diving
mixture. Sincedecompæssion time is dictated by the degree of satura'ÏÏÎ
tion, once this point is reached, decompression time remains the same
]Ï
irrespective of duration
this pressure. The method, therefore,
greay increases the ratio of time spent working to that wasted during
'
decompression—see page 164 ,
_
j
-
SCUBA: stands for self—'contained und6rwater breathing apparatus, of
*
which there are three basic "designs: the closed circuit system—a
cirŒlating, inert gas receives fresh oxygen‘ to replace that used; the
semi—closed system—a pre—mixed gas is metered out into the breathing
'Ï
circuit so that some is rejected :conünuously; and the open system—
compressed air or gas is supplied from cylinders to a demand regulator
'
and each breath is exhausted to the surrounding
159
_
SEICHE:rise and fall of a, water mass, Whether in
or the open sea,
”
which is determined by the structure of the —basin. The
,
this standing Wave may be anything from “a few minutes to many
hours—see page 140
—…
,
,
,
»
SEINE NET: along net which is usedato encircle
_
When the two ends of the net are brought together, cr fpur—sed’, the net
'
is hauled in With its catch—see page 36
_
…'
,
…
,
_
SHADOW ZONE: area of the sea “unlit’ by conventional sonar:becausethe
sound waves are refracted during their passage thr0ugh the
"
page 205
“
_
‘
,
v
81st ship’s inen‘z‘al navigation system—,— ,,
…
_
_— ;
;
SONAR: stands for Sound Navigation wAnd;Rarrging.iAlthough it initially
_
referred to systems using sound to determine the pre“senee,location,cr
'
nature of
systems are now used, much more
_ widely—seepage—205
…
;
..
;
"
…:
..
,
_
SPRINGTIDES—f—SÇÔIÂZZŒ
.…
STORM SURGE: exceptiohally— high water produced by severe
atsea.
Several meteorologïeaî factors may be involved —bütth6 most important
ones are the low. pre‘ssureareas
the storm
the driving force of the high
—up the
É1‘he prole
of, the sea oor orthe
spring fides canehhancethe
'
…
f
…
;
,
,
SWELL: long relatively sÿmmetrieal waves produced by
distant parts
_
_
:
??
TEŒCI—IŒIC: remote
Télééhii‘ic
machines were originally deviséd“ for
nuclear
“? materials bur
induding Underwater
'—
‘
236
Glossary
,
SA‘I‘URATION DIVING: the diver remains at or near the working depth after
"“ÏŸ
his body tissues have become satürated With the inert gas of his diving
mixture. Sincedecompæssion time is dictated by the degree of satura'ÏÏÎ
tion, once this point is reached, decompression time remains the same
]Ï
irrespective of duration
this pressure. The method, therefore,
greay increases the ratio of time spent working to that wasted during
'
decompression—see page 164 ,
_
j
-
SCUBA: stands for self—'contained und6rwater breathing apparatus, of
*
which there are three basic "designs: the closed circuit system—a
cirŒlating, inert gas receives fresh oxygen‘ to replace that used; the
semi—closed system—a pre—mixed gas is metered out into the breathing
'Ï
circuit so that some is rejected :conünuously; and the open system—
compressed air or gas is supplied from cylinders to a demand regulator
'
and each breath is exhausted to the surrounding
159
_
SEICHE:rise and fall of a, water mass, Whether in
or the open sea,
”
which is determined by the structure of the —basin. The
,
this standing Wave may be anything from “a few minutes to many
hours—see page 140
—…
,
,
,
»
SEINE NET: along net which is usedato encircle
_
When the two ends of the net are brought together, cr fpur—sed’, the net
'
is hauled in With its catch—see page 36
_
…'
,
…
,
_
SHADOW ZONE: area of the sea “unlit’ by conventional sonar:becausethe
sound waves are refracted during their passage thr0ugh the
"
page 205
“
_
‘
,
v
81st ship’s inen‘z‘al navigation system—,— ,,
…
_
_— ;
;
SONAR: stands for Sound Navigation wAnd;Rarrging.iAlthough it initially
_
referred to systems using sound to determine the pre“senee,location,cr
'
nature of
systems are now used, much more
_ widely—seepage—205
…
;
..
;
"
…:
..
,
_
SPRINGTIDES—f—SÇÔIÂZZŒ
.…
STORM SURGE: exceptiohally— high water produced by severe
atsea.
Several meteorologïeaî factors may be involved —bütth6 most important
ones are the low. pre‘ssureareas
the storm
the driving force of the high
—up the
É1‘he prole
of, the sea oor orthe
spring fides canehhancethe
'
…
f
…
;
,
,
SWELL: long relatively sÿmmetrieal waves produced by
distant parts
_
_
:
??
TEŒCI—IŒIC: remote
Télééhii‘ic
machines were originally deviséd“ for
nuclear
“? materials bur
induding Underwater
'—
‘