Schatz is the leading manufacturer of classic ships' instruments, and one of very few that still make the mechanical chiming movements that were so familiar to the naval and merchant seaman of 100 years ago. They can sound out the fascinating "Ship's Bells" watchkeeping system of four hours on four hours off, striking one bell after the first half-hour, two after an hour and so on until the end of watch "eight bells" - time to change crew and start the pattern again. The intricate workmanship is protected in stove-lacquered, solid brass cases with thick glass ports, secured by brass scuttle clamps. They have black hands and numerals on white dial. The "Royal Mariner" clock is the mechanical version, whilst the "Royal Ocean" (not illustrated but identical in appearance apart from the key holes in the face) has a battery-driven quartz movement. The matching barometer also includes a thermometer at the bottom of the dial. Cases are 7" diameter, 3" deep. NEW TO THE RANGE - ROYAL OCEAN TIDE CLOCK (shown bottom right) - Tides are primarily influenced by the orbit of the moon. To show this, the Ocean Tide Clock has an extra (blue) hand, which makes a full sweep of the dial at the lunar rate - about 12.5 hours instead of the normal 12 - indicating the state of the tide for a chosen location. Quartz movement, uses one AA battery (see 93195). IMPORTANT - because the lunar cycle varies with the Earth's there are times in a month when actual tides are a few minutes ahead or behind the clock. TWO-YEAR WARRANTY. NOW AVAILABLE - a chrome-plated version of our Royal Mariner clock and barometer.