Miniature tide calculator – Key ring

Abacus tide calculator - keychain Abacus tide calculator, a device that allows you to forecast the time of high tides. The instrument consists of a fixed dial marked from 0 to 360 degrees, an hour scale, and a compass rose. Two movable dials are mounted on it. One indicates the lunar month on a scale of 1-30, and the other has a pointer with the moon's phase beneath it, which changes as the pointer is moved. The device takes into account the wind direction, the number of days since the new moon, and the current lunar age, which allows for the forecasting of tides. A miniature mechanical tide calculator - a reproduction of a device built by Humphrey Cole in 1570. The original is located in the British Museum in London. Made of znallium and brass, lacquered using techniques that are hundreds of years old. On the other side of the device is a beautiful compass rose. The Abacus tide calculator makes a great gift for a sailor, fisherman, astronomer, or lover of technological antiques. Product information: Dimensions: 50 mm diameter, 6 mm depth Weight: 60 g Material: znal, brass User manual in English, French, Italian, and Spanish. Gift packaging: beautiful presentation box with a molded insert.