13823534

Wall Art and Photo Gifts from Mary Evans Picture Library

13823534

Mary Evans Picture Library makes available wonderful images created for people to enjoy over the centuries

Media ID 32276862

© Aviation Ancestry

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> Architecture > Tunnels

> Mary Evans Prints Online > New Images July 2023

VISUAL DESCRIPTION
In this third installment titled "Aircraft in the Making—No. 3," we see another aspect of Boulton & Paul Ltd.'s rigorous approach to aircraft development: Rotary Derivative Apparatus testing equipment used to measure damping effects on scale models within wind tunnels—an innovative method at that time for improving flight stability and performance under various conditions. This unique apparatus highlights how friction can be minimized through clever design while capturing critical information via metronome-timed mercury cups—a testament to early twentieth-century ingenuity intersecting with practical applications.

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