4 0 c m
32cm
actual image size: 24cm x 32cm
Description
This device is used to measure the velocity of an aircraft relative to the speed of sound. Mach 1 is reached when an aircraft attains a speed of 331 metres (1087 feet) per second and thereby 'breaks the sound barrier'. The exact speed varies with altitude. The sound barrier was first broken by the American Bell X-1 aircraft piloted by Chuck Yeagher in 1947. Side showing cutaway section.
Image Details
Image Ref.
10216185
© Science Museum / Science & Society Picture Library