Electromyography and greenhouse: what they have in common

1. Step 1. Electromyography — has part — Amplifier. An amplifier.
2. Step 2. Amplifier — is part of — Electrocardiograph. Biosignal amplifiers.
3. Step 3. Electrocardiograph — is made of — Silver. The quartz string of Einthoven’s galvanometer is silvered.
4. Step 4. Silver — is material for — Wall mirror. Silvering.
5. Step 5. Wall mirror — has part — Window glass. Sheet glass.
6. Step 6. Window glass — is part of — Greenhouse. It lets light in and holds heat.

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