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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 ...
[1] In addition to the board, the playing equipment includes: [1] 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.
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).
The hourglass, invented in Europe, was one of the few reliable methods of measuring time at sea. In medieval Europe, purely mechanical clocks were developed after the invention of the bell-striking alarm, used to signal the correct time to ring monastic bells.
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