UNIVAC I and telescope: what they have in common

1. Step 1. UNIVAC I — has part — Magnetic tape. Tape drives.
2. Step 2. Magnetic tape — is part of — Tape recorder. Magnetic tape.
3. Step 3. Tape recorder — has part — Electromagnet. Recording heads are electromagnets.
4. Step 4. Electromagnet — is part of — Electrical telegraph. Morse’s receiver.
5. Step 5. Electrical telegraph — evolved from — Optical telegraph. The electrical telegraph replaced semaphore lines.
6. Step 6. Optical telegraph — uses — Telescope. Signals were read through a telescope.

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