The Speed of Light - The Most Accurate Measurement of All Time

This is the story of how a Pittsburgh steel worker became the lensmaker behind some of the most important experiments of 19th century physics. John Brashear fell in love with the night sky as a kid in the 1840s. Though he took a job as a millwright, in his free time, he and his wife dedicated themselves to making a telescope lens so they could view the stars. With only an elementary education (and the mentorship of Samuel Langley at the Allegheny Observatory), John became one of the world’s preeminent opticians. His lenses were commissioned for telescopes, spectrographs, and, most significantly, for the famous Michelson-Morley Experiment which failed to detect the luminiferous aether. The dismissal of the aether may have set up Albert Einstein’s theory of relativity and modern physics. Not only was John Brashear a talented lensmaker, he was also dedicated to making the stars and the night sky accessible to all. He gave free astronomy lectures, visited schools and churches, and even a prison to ensure that regardless of someone’s situation, they could appreciate the beauty of the stars. Through his optical devices and outreach, John Brashear facilitated better access to celestial objects.