Tracker bar e Máquina analítica de Babbage: o que têm em comum

1. Passo 1. Tracker bar — faz parte de — Player piano. Holes let air through to the valves.
2. Passo 2. Player piano — funciona como — Jacquard loom. A perforated medium controls a machine — a weaving one in one case, a musical one in the other.
3. Passo 3. Jacquard loom — inspirou — Máquina analítica de Babbage. Babbage borrowed Jacquard’s punched cards directly for entering operations and data; Ada Lovelace compared the machine to the Jacquard loom.

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