Tide clocks have an additional hand that sweeps at approximately 12 hours and 25 minutes. Because the lunar cycle varies in length day by day, but is constant over a cycle of 28 days, there will be times when the tide indicator varies by a few minutes ahead of or behind the actual tides.
The quartz movement is housed in a heavy cast and polished brass case with a hinged bevelled glass door which is secured with two scuttle clamps. The good quality quartz movement is powered by a single AA battery.
Outside diameter 230 mm
Face diameter 140 mm
Depth 57 mm
Matching Saloon Wall Clock and Barometer are also available.