Converting money by adding an additional dial which is graduated logarithmically to a watch face and employing a number of hands at fixed relative angles to represent the same number of currencies

摘要

A watch may be adapted to convert currencies by adding a ring (1) to the watch face and installing a number of hands (2) equal to the number of currencies to be converted. The ring is graduated logarithmically and the hands are fixed at relative angles representing the exchange rates. The hands may be rotated together around the ring manually or by button (3). Alternatively the ring may be rotated with respect to the hands.