Sun-dial clock displaying time and month - has concentric glass globes providing focal point from incident sunlight cooperating with time scale

摘要

The clock, displaying the time of day and/or the time of year has a fluid-filled glass globe (12), contd. within a concentric hollow glass globe (14). The sizes of the two glass globes (12,14) are selected so that the inner globe (12) acts as a spherical optical lens with the focal point varied in dependence on the contd. fluid. The focal point cooperates with a time scale (16) for acting as a movable indicator, pref. allowing the time of day, the condition of the sun and the month of the year to be indicated. Pref. the inner globe (12) is filled after mfr. with the fluid selected to obtain the optimum colour, light filtration and light reduction characteristics to be obtained. ADVANTAGE - Provides easily read time display.