Rubik’s Cube e telescope: o que têm em comum

1. Passo 1. Rubik’s Cube — tem como parte — Spring. Springs adjust the tension.
2. Passo 2. Spring — faz parte de — Rotary dial. A return spring.
3. Passo 3. Rotary dial — faz parte de — Telephone. A dial.
4. Passo 4. Telephone — evoluiu de — Electrical telegraph. The telephone grew out of attempts to send several signals over telegraph lines (the “harmonic telegraph”).
5. Passo 5. Electrical telegraph — evoluiu de — Optical telegraph. The electrical telegraph replaced semaphore lines.
6. Passo 6. Optical telegraph — utiliza — Telescope. Signals were read through a telescope.

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