Two glass bulbs and oil well: what they have in common

1. Step 1. Two glass bulbs — is part of — Hourglass. Glass vessels.
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 part of — Block and tackle. The rope runs around the pulleys.
5. Step 5. Block and tackle — is part of — Drilling rig. The block and tackle lifts the drill string.
6. Step 6. Drilling rig — is used in — Oil well. A well is drilled by a rig.

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