Copper gilded equatorial watch combination instrument

[Copper gilded equatorial watch combination instrument]

Copper gilded equatorial watch combination instrument, 18th century, dial 42.3 cm long and 28 cm wide, made in London, England. The old collection of the Qing Palace
This composite instrument has a round instrument base at the bottom and three spirals at the bottom to adjust the horizontal plane of the round seat. The round seat is equipped with long bolts to adjust the direction of the dial. The base is equipped with a rectangular dial, one end of which is a sundial, the dial needle is a triangle, and a latitude arc is set at the bottom, on which 20 ° – 80 ° is carved. A swinging arrow-shaped pointer hanging on the slant of the dial needle is used to indicate latitude. The time line and timing Roman numerals are carved around the dial needle
The side sealed with the sundial is a gnomon. There are rectangular arms on both sides of the gnomon, and there are chutes on the inside of the arms. The gnomon can be moved in the rectangular frame through the screw as needed. Under the gnomon, the twelve zodiac signs are carved, with each sign of 30 °. The watch is carved with a semicircular time plate
The combination instrument is an instrument that sets the equatorial sundial and the gnomon on a rectangular dial. The equatorial sundial can know the time by measuring the shadow of the sun; The compass can calculate the position of the sun on the ecliptic by measuring the length of the shadow of the meridian timing table, so as to know the current solar term and direction
When making this instrument in Britain, in order to adapt to the habits of the Chinese people, the original zodiac zodiac was carved with the name of the traditional Chinese zodiac
The dial is engraved with the inscription “London”.

铜镀金赤道圭表合壁仪晷盘