Power loom and tunnelling shield: what they have in common

1. Step 1. Power loom — has part — Cam. Cams lift the heddles.
2. Step 2. Cam — is part of — Trip hammer. Cams on the shaft lift the hammer.
3. Step 3. Trip hammer — evolved into — Steam hammer. The mechanization of forging.
4. Step 4. Steam hammer — evolved into — Forging press. Pressing instead of striking.
5. Step 5. Forging press — has part — Hydraulic cylinder. Working cylinders.
6. Step 6. Hydraulic cylinder — is used in — Tunnelling shield. The shield was pushed forward by jacks.

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