This is a fascinating lecture by Roger W. Smith, presented at the Horological Society of New York in December 2017.
In this video, Roger Smith talks about the development of a practical watch escapement. Roger Smith is the inventor of the single wheel Co-Axial escapement, as well as a direct student and protege of George Daniels.
In this video, Mr. Smith refers to a lecture given to American Watchmakers-Clockmakers Institute (AWCI) by George Daniels in 1990. You can view that lecture here.
So, grab a cup of tea, sit back and enjoy this easy-going talk about what makes a successful watch escapement.