The Fascinating Principle of Ergonomic Design

A black-and-white photo shows a crashed B-17 bomber on its belly on an airfield. To the right, a diagram displays six cockpit control knobs with labels: Flap Control Knob, Landing Gear Control Knob, Mixture Control Knob, Supercharger Control Knob, Power or Thrust Knob, and Propeller Control Knob. The text explains how identical shapes of adjacent knobs caused pilots to confuse them, leading to crashes, and how shape coding later solved the problem.

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