Wrist watch with two mechanical circular data indication discs and dial face

摘要

The wristwatch contains two circular discs, arranged so that 31 days of a month are arranged with equal spacing around the circumference of the two discs, and at the same distance to their centre points. These numbers are indicated successively in an ascending sequence. The two discs (3, 5) are arranged centrally one over the other, under the dial face (1) provided with a window (2), rotatable about the common centre point. The lower disc (5) carries the numbers 1 to 16 in a 22.5 deg. spacing, and on the top disc (3), near the figures (17-31) a cut out in the circumference, also found in the 22.5 deg. spacing. The figures of both discs as well as the cut out, are so arranged, that they at least once in 31 days are positioned coinciding with the window. The common circuit in this case, is the jump of the lower disc from the "16" on to the "1", and the top disc from the cut out on to the "17".