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Inventions of the Great War

A. Russell (Alexander Russell) Bond1919




dazzle camouflage

"When U-boat commanders took observations on a ship painted with a "dazzle" camouflage, they saw a shimmering image which it was hard for them to measure on the fine graduations of their periscopes." - Inventions of the Great War

If U-boats stayed up for long, they'd be spotted, so they had to quickly get a enemy ship's bearing, heading, speed, and range. This was an attempt to confuse their efforts.