Weems and Plath Endurance II 135 Barometer/Thermometer - Manual (Page 9)

To Set Tide:
Adjust the tide hand to high or low tide using the larger gear wheel which
is located below the battery compartment. To adjust the gear wheel, use
the tip of a ball point pen or similar blunt instrument to apply sideways
pressure to one of the gear spokes. It is normal for the tide hand to have
some “play” to it. This allows for proper rotation of the hand. Note: For best
results set clock to “High Tide” at your location during a full moon or new
moon phase. PLEASE NOTE: Tide fluctuations (high and low tide) vary
from one place to another. Therefore, the tide hand will indicate high and
low tide for a particular location only. Official Tide Tables - available
at harbor authorities, or online, etc. - will supply the exact time of high
tide. High and low tides of the Atlantic seaboard of America and Europe
have a fluctuation rhythm of between 12 and 13 hours. Because of this, the
tide indicator will show average values only, which for general requirements
will be satisfactory. Other variables such as wind, atmospheric pressure,
the relative position of the moon and the elliptical
pattern of the sun will affect the tide slightly. These
phenomena least affect the tide at the time of the
full moon. For this reason, the best times to set your
tide clock are at the time of the full moon and to
a lesser extent, the new moon. Initially, you may
notice some slight variations in the readings. The
readings will “average out,” and by the time of the
next full moon, your tide clock will accurately depict
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