Hans Renold

Hans Renold was a Swiss engineer who made a lot of important discoveries about how to make metals stronger and more durable. He developed the concept of 'fatigue' which means that when a metal is put under a lot of stress, it will get weaker over time. Hans also invented the ‘Renold Chain’ that helped to make bicycles and other machines work more efficiently. He was an important figure in the development of new types of materials, which help to make our world a better place.