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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.
Nov 19, 2019 · The hourglass is sometimes referred to as a sand clock or a sandglass. Like other timepieces, it needs to be carefully calibrated. The hourglass maker must test the instrument and fine tune it to measure the correct length of time.
It is also known as a sandglass or a log glass when used in conjunction with the common log for ascertaining the speed of a ship. It consists of two pear-shaped bulbs of glass, united at their apexes and having a minute passage formed between them.
- The Editors of Encyclopaedia Britannica
Some hourglasses were quite elaborate and fit the name “sand clock” better than “hourglass”. Some sand clocks were a series of hourglasses that could be flipped independently. Some would mark the quarter and half hour while others would mark a whole hour or two hours.
An instrument for measuring time, consisting of two glass chambers connected by a narrow neck and containing a quantity of sand, mercury, or another flowing substance that trickles from the upper chamber to the lower in a fixed amount of time, often one hour.
May 17, 2018 · The hourglass or sand clock follows exactly the same principle as the clepsydra. Two globes (also called phials or ampules) of glass are connected by a narrow throat so that sand (with relatively uniform grain size) flows from the upper globe to the lower.
Mar 20, 2023 · An hourglass or sand clock consists of two glass bulbs connected by a narrow opening that allows the fine sand stored in the top bulb to slowly but steadily pass through it to the bottom bulb. The duration of an interval corresponds with the duration of the sand flow.
