Glass window and incandescent light bulb: what they have in common

1. Step 1. Glass window — is part of — Cloud chamber. Observing and photographing the tracks.
2. Step 2. Cloud chamber — evolved into — Bubble chamber. A liquid instead of vapour.
3. Step 3. Bubble chamber — has part — Camera. Photographing the tracks.
4. Step 4. Camera — has part — Lens. A camera’s lens.
5. Step 5. Lens — is part of — Film projector. A projection lens.
6. Step 6. Film projector — has part — Incandescent light bulb. The light source (formerly an arc).

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