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An hourglass (or sandglass, sand timer, or sand clock) is a device used to measure the passage of time. It comprises two glass bulbs connected vertically by a narrow neck that allows a regulated flow of a substance (historically sand) from the upper bulb to the lower one due to gravity. Typically, the upper and lower bulbs are symmetric so that ...
1859 Helmsman's marine sandglass, in a four-column wood stand. A marine sandglass is a timepiece of simple design that is a relative of the common hourglass, a marine (nautical) instrument known since the 14th century (although reasonably presumed to be of very ancient use and origin). Sandglasses were used to measure the time at sea or on a ...
History of timekeeping devices. A marine sandglass. It is related to the hourglass, nowadays often used symbolically to represent the concept of time. The history of timekeeping devices dates back to when ancient civilizations first observed astronomical bodies as they moved across the sky. Devices and methods for keeping time have gradually ...
An egg timer or kitchen timer is a device whose primary function is to assist in timing during cooking; the name comes from the first timers initially being used for the timing of cooking eggs. Early designs simply counted down for a specific period of time. Some modern designs can time more accurately by depending on water temperature rather ...
"Still-Life with a Skull" by Philippe de Champaigne, c. 1671. The sands of time is an English idiom relating the passage of time to the sand in an hourglass.. The hourglass is an antiquated timing instrument consisting of two glass chambers connected vertically by a narrow passage which allows sand to trickle from the upper part to the lower by means of gravity.
The Astrarium of Giovanni Dondi dell'Orologio was a complex astronomical clock built between 1348 and 1364 in Padova, Italy, by the doctor and clock-maker Giovanni Dondi dell'Orologio. The Astrarium had seven faces and 107 moving gears; it showed the positions of the sun, the moon and the five planets then known, as well as religious feast days.
Water clock. A display of two outflow water clocks from the Ancient Agora Museum in Athens. The top is an original from the late 5th century BC. The bottom is a reconstruction of a clay original. A water clock or clepsydra (from Ancient Greek κλεψύδρα (klepsúdra) ' pipette, water clock'; from κλέπτω (kléptō) 'to steal' and ...
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