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Antique compasses/6787-Antique sundial
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Code 6787
EUR 1000.00
In stock

EUR 1000.00
In stock

used

1607078456Code 6787 Antique sundialEngraved boxwood sundial with brass hinges, book-shaped, English manufacture from the second half of the 18th century. The clock is equipped with a compass for orientation inserted in the base with a needle lock and complete with a compass card on paper with eight winds and a goniometric circle. The gnomon is made up of a thread that is put under tension, according to the direction of the celestial axis, when the clock lid is opened. The hour dial is traced inside the lid, indicating the daytime hours The operation of the sundial depends on the apparent movement of the Sun. It consists of a gnomon or stylus that projects the sun's shadow on a surface crossed by the tracing of hour lines. To read the time correctly, the watch must face north, which is done using the compass.

Inside the lid some instructions: "Sundial and compass. Slip the notch in the Brass Arm over the Stud in Lid and put the compass on a livel place, in such a position that the North Point of the needle corresponds with the mark inside the Compass Box, the shadow of the Cord will show the time. The Sun Dial shows solar or apparent time but a clock should be set to equal or mean time: in the above equation table the difference is rated in minutes F means that the clock should be faster than the Dial Sun slower."

This simple and ingenious system spread in the 17th and 18th centuries through the production of specimens, of wood or ivory. Excellent condition, fully functional. Closed 7.5x5.5 cm - 2.95x2.16 inches, thickness 2 cm - 0.78 inches.

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Code 6787 Antique sundial

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