A great episode of the late eighties BBC series "The Secret Life of Machines". This particular episode (featured in three parts below) focuses on the development and technology leading up to quartz watches but there is much much more in this show. Everything from sundials, water clocks, church clocks, mechanical pocket watches, the first wristwatches, vintage watch commercials, electric, tuning fork, solid state, LCD, LED, and the modern analog Quartz.