A. A. Michelson measured the speed of light in air and water, establishing a quantitative foundation for the wave theory of light. For more precise calculation and measurements, Michelson built harmonic analyzers. These devices calculate which simple, regular waves are combined to produce complex waves, such as ocean waves, sound waves in a musical chord or the light waves from a star. In 1898, Michelson, working with Samuel W. Stratton, designed this 80 element harmonic analyzer to study light waves.