Rope core and autoclave: what they have in common

1. Step 1. Rope core — is part of — Climbing rope. It carries the load and stretches when jerked.
2. Step 2. Climbing rope — is made of — Nylon. Nylon.
3. Step 3. Nylon — is material for — Digital blood pressure monitor. The cuff is nylon.
4. Step 4. Digital blood pressure monitor — evolved from — Blood pressure monitor. An automatic blood pressure monitor.
5. Step 5. Blood pressure monitor — evolved from — Manometer. A blood pressure monitor is a manometer connected to a cuff: it measures the air pressure that squeezes the artery.
6. Step 6. Manometer — is part of — Autoclave. The gauge shows whether the steam pressure in the chamber is high enough to sterilize.

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