Daguerreotype and incandescent light bulb: what they have in common

1. Step 1. Daguerreotype — uses — Silver halide. A silvered plate with silver iodide.
2. Step 2. Silver halide — is material for — Photographic film. The emulsion.
3. Step 3. Photographic film — is used in — Film projector. It shows film.
4. Step 4. Film projector — has part — Incandescent light bulb. The light source (formerly an arc).

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