Precious sand and sundials - Germany / German Democratic Republic 1983 - 10 Pfennig

Precious sand and sundials The Department of Postal and Telecommunications of the German Democratic Republic publishes six multicolored special postage stamps with images of sand and sundials from the State Mathematical-Physical Salon Dresden. Special cancellations from June 7 to August 6, 1983 Precious sand and sundials In the collection of watches of the State Mathematical-Physical Salon in the Dresden Zwinger, the sun and sand clocks from four centuries occupy a significant, much-acclaimed place. The history of the sundial, the oldest human timekeeping instrument, goes back well over 4,000 years, to ancient times in Egypt, China and Mesopotamia. In ancient times, sundials of various designs, including small portable instruments, were widely used, especially by Greeks and Romans. The "modern" sundial with earth-axes parallel polos, which indicates the same (equinoctial) hours, is an invention of the Arabs. It experienced its heyday in the 16th and 17th centuries. Variety, richness of forms, noble material and decorative design of sundials in master craftsmanship show the great interest that has been placed in these timepieces as objects of utility as well as representation in past centuries, especially in the Renaissance and Baroque periods. 10 Pfennig value: Pulpit clock, around 1700 Material: iron, wood, glass; Height: 68.5 cm As is usual with pulpit clocks, the passage time of the sand in the four pairs of glasses is 1/4, 2/4, 3/4, 4/4 hours. After the expiry of the appropriate glass, the entire glass frame must be rotated about the center pin of the decorative iron forged ironing stand for the next measurement.