the.com/sandglass
Time, shrunk to a pinch of falling dust between two stubborn bulbs.
means An hourglass-style timer that measures a fixed interval by sand trickling through a narrow neck.
from From sand plus glass, plainly enough; the device itself dates to medieval Europe, prized aboard ships where pendulums refused to sit still on rolling seas.
Naval dutySailors flipped them to log ship speed and watch shifts.
Not actual sandMany used powdered marble, eggshell, or tin for smoother flow.
Neck obsessionBore width, not sand amount, governs the timing.