Science, Maths & Technology
Understanding science: what we cannot know
...leadership of Louis Essen, who had earlier made accurate measurements of the speed of light. It is now at the Science Museum in London. [This is a black-and-white photograph of two men examining the first practical atomic clock.] Figure 1 Louis Essen (right) and the first practical atomic clock With these clocks, physicists soon discovered that ‘atomic time’ is far...