Fine sand and elevator: what they have in common

1. Step 1. Fine sand — is material for — Hourglass. Fine, uniform sand.
2. Step 2. Hourglass — is used in — Chip log. The time of a speed measurement was taken with an hourglass.
3. Step 3. Chip log — has part — Rope. On a line with knots.
4. Step 4. Rope — is used in — Pulley. A rope runs over the pulley.
5. Step 5. Pulley — is part of — Elevator. The rope runs over a pulley.

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