Hourglass

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Referring to a cylindrical or elongated structure with a central constriction likened, sometimes in only a very general sense, to an hourglass
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References in periodicals archive ?
Students are told that they will each make a sand timer. I begin by making a model timer, going through the steps and having the students predict outcomes.
Other features include a sand timer that delays the presentation of the picture choices so there is a greater challenge to the child's working memory; on/off settings for text; choice of color drawing icons or stick figures; and a progress/data tracker that allows the user to collect and save data, and email or print it.
A modern take on a traditional sand timer, the sand takes four minutes to flow through.
The latter contains items such as a diary where you note how you feel when you tuck into something sweet, or a sand timer so you wait one minute before ripping open that wrapper.
IPPR's report was carried out by Newcastle-based organisation The Sand Timer which argues action needs to be taken to remove barriers obstructing older people from getting jobs.
Readers are also introduced to other devices for measuring time, such as egg timers, stopwatches, and kitchen timers; instructions are also given to make a sand timer. Other early devices that appear in the book include water clocks, candle clocks, and sundials.
Starling out with combinations such as Qu, Th, and He opens up the possibilities for creating longer words and getting higher scores.The game includes a dome cover for the grid to make mixing up the letters easier and a three-minute sand timer.