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PREPARATION-continued
______
_
The preceding instructions must
be
performed
on
each
user-serviceable O-ring prior to each dive day and, if
possible, prior to each dive.
By
following these pro-
cedures and all other procedures
in
this instruction
manual,
you
will
be
able to enjoy using your Nikonos
8peedlight 8B-102 for many years.
Reminder:
An
extra set of O-rings and a tube of lubri-
cant are supplied with the flash unit. Additional O-rings
and lubricant are available from authorized Nikon
dealers and service centers.
The
O-rings
and
their sealing method
The
method used by the O-rings to seal and waterproof
the flash unit
is
shown
in
the following illustrations.
When a low level of pressure exists (for instance, just
under the water's surface), each O-ring seals its groove
by
its own elastic force (see Chart
A).
When the pres-
sure increases (at greater depths), the O-ring's shape
is
altered and its sealing ability
is
increased to withstand
the greater pressure. The pressure changes the ring
from its original
"0 " shape (when looking at a cross-
sectional view) to a
'.'
D" shape (see Chart
B).
Pressure
i
)y-
Chart A Chart B
• Slight
compression
6
O-rings