Arithmometer and kiln: what they have in common

1. Step 1. Arithmometer — has part — Crank. The handle for adding and subtracting.
2. Step 2. Crank — is part of — Steam locomotive. Connecting rods and cranks carry the piston stroke to the wheels.
3. Step 3. Steam locomotive — has part — Chimney. Smoke from the firebox leaves through the locomotive's chimney.
4. Step 4. Chimney — is part of — Kiln. The chimney creates a draught.

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