Sliding transom and fitness tracker: what they have in common

1. Step 1. Sliding transom — is part of — Jacob’s staff. A movable arm for measuring the angle.
2. Step 2. Jacob’s staff — works like — Quadrant. Two angle gauges for measuring the altitude of celestial bodies.
3. Step 3. Quadrant — uses — Universal gravitation. The angle is read against a plumb line.
4. Step 4. Universal gravitation — is a kind of — Newton’s laws. Part of Newtonian mechanics.
5. Step 5. Newton’s laws — is used in — Accelerometer. The sensor measures the force of inertia.
6. Step 6. Accelerometer — is part of — Fitness tracker. A pedometer.

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