A Perpetual Planetary Hour Dial, Indicating also the Times of Sunrise and Sunset.

摘要

37. Lewis, W. H. Jan. 2. Dials.-To'a clock dial are attached tables showing times of sunrise and sunset, and rotatable rings marked as shown with planetary symbols and days of the week, adapted to show the "planetary "forces which are ruling any period of time for " any day. " The tables may also be adapted to an ordinary twelve-hour dial.