Small mirror and knife: what they have in common

1. Step 1. Small mirror — is part of — Torsion balance. It reflects the beam for reading the angle.
2. Step 2. Torsion balance — is made of — Silver. The suspension fibre is a thin silver wire.
3. Step 3. Silver — is material for — Syringe. Early needles were silver.
4. Step 4. Syringe — has part — Needle. A hollow needle.
5. Step 5. Needle — is part of — Overlocker. Needles sew the stitch.
6. Step 6. Overlocker — has part — Knife. A knife for trimming the edge.

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