13868129

Wall Art and Photo Gifts from Mary Evans Picture Library

13868129

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

Media ID 32314228

© Aviation Ancestry

VISUAL DESCRIPTION
This vintage advertisement emphasizes the importance of specifying particle size when discussing filtration efficiency. The bold, crossed-out "99.9%" suggests skepticism towards claims that don't provide detailed information about what is actually being filtered. The ad highlights Vokes' focus on precision in filtration, arguing that without knowing the size of particles a filter can trap, efficiency percentages are meaningless. It's an early example of marketing that challenges industry standards and promotes transparency.

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