Continuously variable transmission and screw press: what they have in common

1. Step 1. Continuously variable transmission — is a kind of — Automatic transmission. A CVT is an automatic gearbox without steps: the ratio changes smoothly.
2. Step 2. Automatic transmission — has part — Planetary gear. Planetary gear sets.
3. Step 3. Planetary gear — is part of — Watt steam engine. Watt’s “sun and planet” gear got around the patent on the crank.
4. Step 4. Watt steam engine — is part of — Rotary printing press. The first rotary presses were steam-driven.
5. Step 5. Rotary printing press — evolved from — Gutenberg printing press. Cylinders instead of a flat press.
6. Step 6. Gutenberg printing press — has part — Screw press. Gutenberg adapted the screw press known from pressing grapes.

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