10" Teakwood Brass Porthole Tide Clock - Brand New Lacquer protected for a lasting shine! 3 yr. Warranty Start Price USD 149.99 Current Price USD 149.99 Time Left - Bid Count 0 Buy It Now Price - Reserve Price - Start Time Wednesday, September 17, 2008 End Time Saturday, December 20, 2008 Location Yorktown, VA See more about '10" Teakwood Brass Porthole Tide Clock - Brand New' Description MooreClocks Store **10" Brass Porthole Tide Clock** *** **Clock Features: ** *SOLID BRASS * Solid Teakwood Brand New Tide & Time Clock MSRP $ 159.99 Ten inches in Diameter The Teak is stained in a medium finish Full glass enclosure Beautiful Solid Brass Porthole with working turn buckles 2-1/2 inches in base height. Tide Tracking with Time included. Large 6" inch viewable dial. Four Pounds of Solid Polished Brass & Solid Teak Wood This Quality Time Piece is made to last for many years! We test our clocks for accuracy before we ship! Full instructions included. Same day shipping. Full Three year warranty included. The tide movement works off a 12:25 minute rotation for every 360 degrees. Local tide tracking for your area on the East Coastal Waterways. Please email us on any questions on our full line of Tide Tracking Clocks. MooreClocks Tidal Information The tide is the regular rising and falling of the ocean's surface caused by the Moon's gravity (and to a lesser degree the Sun's). The maximum water level is called high tide; the minimum level is low tide. At any given point on the ocean, there are normally two high tides and two low tides each day. On average, high tides occur 12 hours 24 minutes apart. The 12 hours is due to the Earth's rotation, and the 24 minutes to the Moon's orbit. It is often assumed that the tides are simply the Moon's gravitational force pulling the oceans' water toward itself, but this is wrong. Were it so, there would only be one high tide every 24 hours (imagine the water around the Earth with a single bulge pointing towards the Moon). Instead, the tide is caused by tidal forces, which are due to the difference in gravitational attraction on the near and far sides of a body. The tidal force produces two bulges: one pointing towards the Moon, and one pointing away. This is also why the Moon is the major cause of the tides: at the Earth's surface the straightforward gravitational attraction of the Sun is considerably larger than that of the Moon, but the difference in the Moon's grativational force from the near side of the Earth to the far side is much greater than the Sun's .*** NAUTICAL TIDE CLOCKS Have Questions? Email Me @ MooreClocks We Ship World Wide Email us on Rates to Canada and the United Kingdom. We will give you the best rate available. Place a Bid!