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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 ...
The game also includes tiles, one for each letter of the alphabet, a five-minute sand timer, and scorecards. A round of the game begins with players taking turns drawing cards and selecting a Class from it (or optionally a more specific Category within that class). Five Categories are selected this way.
6 hourglass sand timers (3-minute), 3 in each color (black and red) 1 neutral hourglass timer (15-second) 64 identical rings, half distributed to each player; 2 ring holders (each holds 32 rings) The board includes sockets at each playable point that will hold an hourglass upright. The 18 sockets on the outer edge of the board has a depth that ...
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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).
Early versions erred by less than one minute per day, and later ones only by 10 seconds, very accurate for their time. Dials that showed minutes and seconds became common after the increase in accuracy made possible by the pendulum clock. Brahe used clocks with minutes and seconds to observe stellar positions. [112]