Beatrice Tinsley was well known in what field?

Question

What was the profession of the person who invented the mechanism of the door lock for London toilets operated by payment of a coin, initially one penny?

Answer 1

Astronomy
Dr Beatrice Tinsley was a New Zealand educated physicist and astronomer. She completed pioneering studies of how populations of stars age and affect the observable qualities of galaxies, and her work led to the first approximation of what protogalaxies should look like.