Brake caliper and Babbage’s Analytical Engine: what they have in common

1. Step 1. Brake caliper — has part — Piston. Pistons.
2. Step 2. Piston — is part of — Insulin pump. The reservoir’s plunger.
3. Step 3. Insulin pump — has part — Servomotor. A stepper motor moves the plunger.
4. Step 4. Servomotor — is part of — 3D printer. Stepper motors.
5. Step 5. 3D printer — uses — Program control of a machine. The layers are set by a program (G-code), as with CNC.
6. Step 6. Program control of a machine — is used in — Babbage’s Analytical Engine. The first concept of a general-purpose machine controlled by a program.

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