Made from solid unlacquered Brass and beveled glass. This tide clock and barometer set comes with quartz movement and have a sealed unit with an adjustment mechanism.  The Tide Clock features an additional hand which records lunar time over a 24 hour and 50 minute period which approximates to the cycle of high and low tides. Size Wood dimensions 15 x 29cm Clock and Barometer dimensions Back Flange Diameter 117mm Face and Dial Diameter 84mm Depth 52mm