Serrated tweezer tips and Babbage’s Analytical Engine: what they have in common

1. Step 1. Serrated tweezer tips — is part of — Surgical forceps. A firm grip on the fabric.
2. Step 2. Surgical forceps — evolved into — Haemostat. A clamp with a lock.
3. Step 3. Haemostat — has part — Ratchet. A ratchet lock.
4. Step 4. Ratchet — is a kind of — Gear. A toothed wheel with a pawl.
5. Step 5. Gear — is part of — Babbage’s Analytical Engine. Gears performed the calculations.

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