Top and bottom halves of a nesting doll and Babbage’s Analytical Engine: what they have in common

1. Step 1. Top and bottom halves of a nesting doll — is part of — Matryoshka. Turned parts of the body.
2. Step 2. Matryoshka — uses — Lathe. Turned on a lathe.
3. Step 3. Lathe — evolved into — Screw-cutting lathe. Maudslay added a lead screw and a slide rest.
4. Step 4. Screw-cutting lathe — has part — Gear. Change gears set the pitch of the thread.
5. Step 5. Gear — is part of — Babbage’s Analytical Engine. Gears performed the calculations.

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