An hourglass was used as a timer, with the size of the hourglass determining the length of time it measured.
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sand + glass = hourglass
glass+sand=hourglass
the hourglass and a cog :)
It is a hypothesis that can be defined as a tantative explanation of the hourglass notion of research
If by "glass" you mean the hourglass from Phantom Hourglass, you can't draw an actual hourglass, you need to draw an Arabic numeral eight. (like this: 8) If you draw the figure with one circle on top of a smaller circle, it won't work.