Interesting annular solar watches, one of the options for the road – and they both served as decorative pendants. The main part was brass ring of a few centimeters in diameter, combined with other mobile ring equipped with a hole to the solar beam. At the outer surface of the main ring engraved initials months, but against them on the inner surface, was the hour scale. Before the measurement it was necessary to rotate the lower ring, so that the hole for the beam was the name of the desired month. To measure the time clock exhibited so that the ray of sunlight passed through the hole and said hour scale. The first description of the hours – in a ring with a seal – in the book doctor Bonn, was published in Paris in 1500. Read the rest of this entry »