Glass window and hollerith tabulator: 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 — Electromagnet. The field bends the tracks.
4. Step 4. Electromagnet — is part of — Relay. An electromagnet switches the contacts.
5. Step 5. Relay — is part of — Hollerith tabulator. Relays controlled the sorting box.

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